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Syllabus

Long Type Questions(3 marks)

_{2}and hence derive expression for the energy density of the capacitor._{1}and n_{2}(n_{2}> n_{1}) respectively. Using this diagram, derive the relation.What happens to the focal length of convex lens when it is immersed in water?_{1}, C_{2}and C_{3}are connectedOR(1) $\frac{3g}{4}$

(2) $\frac{4g}{3}$

(3) $\frac{2g}{3}$

(4) $\frac{3g}{2}$

what is displacement current????

what is conduction current???

identify the part of the electromagnetic spectrum which is

1.suitable for radar system used in aircraft navigation.

2.adjacent to low frequency end of the electromagnetic spectrum.

3.produced in nuclear reactions.

i need numericals solutions of nootan for physics plz help me to find this?

such that water coming out from them have same range. If the range of water coming out of the holes

is half of maximum range, then the distance x between these holes is

$\left(1\right)\frac{\sqrt{5}H}{4}\phantom{\rule{0ex}{0ex}}\left(2\right)\frac{\sqrt{3}H}{4}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{2H}{3}\phantom{\rule{0ex}{0ex}}\left(4\right)\frac{\sqrt{3}H}{2}$

derive the dimensional formula of magnetic flux with each steps clearly???

self induction is called the inertia of electricity.why?

show that lenz's law is in accordance with the law of conservation of energy???

1) 5

2) 20

3) 10

4) zero

A coil of mean area 500 cm^2 of having 1000 turns is held perpendicular to a uniform field of 0.4 Gauss.The coil is turned through 180 degree in 1/10th of a second.Calculate the average induced E.M.F.

44. A uniform rod of mass m is moving with constant velocity v

_{0}in a perpendicular uniform magnetic field B as shown. The resistance of rod is r. The current flowing through rod, R_{1}and R_{2}are respectively.$\left(1\right)\frac{B{v}_{0}L}{3r},\frac{2}{3},\frac{B{v}_{0}L}{3r},\frac{1}{3}\frac{B{v}_{0}L}{3r}\phantom{\rule{0ex}{0ex}}\left(2\right)\frac{B{v}_{0}L}{3r},\frac{1}{3},\frac{B{v}_{0}L}{3r},\frac{2}{3}\frac{B{v}_{0}L}{3r}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{B{v}_{0}L}{3r},\frac{1}{3},\frac{B{v}_{0}L}{3r},\frac{1}{3}\frac{B{v}_{0}L}{3r}\phantom{\rule{0ex}{0ex}}\left(4\right)\frac{B{v}_{0}L}{3r},\frac{B{v}_{0}L}{3r},\frac{B{v}_{0}L}{3r}$

Why a transformer cannot step up dc voltage?

What is The difference Between Lenz's law and lorentz force??

Prove that an ideal inductor does not dissipate power in an a.c circuit.

Magnetic field in a region is equal to B. A loop of resistance R and radius r is lying in the field with the plane perpendicular to the field if the loop is turned by 180 degree. Find the charge which flows through a given cross section of the loop

can any please xplain ac generator?

answer fast please

The loop in question # 1 is rotated to that it is parallel to the magnetic field. If this takes 0.1 seconds, find the voltage induced in the loop.

The magnetic flux through a coil containing 50 loops changes from 30 Wb to ?30 Wb in 0.42 seconds. What is the voltage induced in the coil?

A square coil, 6.5 cm on a side, consists of 275 loops. If the magnetic field is perpendicular to the loop, find the voltage induced if the field changes from 2.0 T to 0.5 T in 0.05 seconds.

description about dead beat galvanometer

Q11.Which unit denotes the dimensions ML

^{2}T^{−2}A^{−1}?Weber (Wb)

Henry (H)

Wb/m

^{2}H/m

^{2}^{}i cant understand plz derive dimensional formula for all of above quantities.

HOW DOES THE MUTUAL INDUCTANCE OF A PAIR OF COIL CHANGE WHEN

1 THE DISTANCE B/W 2 COIL IS INCREASED

2 NUMBER OF TURNS IN EACH OF 2 COIL IS DECREASED

^{o}about it's one of the diameters in 2 seconds. Find the rate of change of magnetic flux through the coil._{0}out of the page, find emf developed between two points of rod./$\left(1\right)\frac{1}{2}B\omega {l}^{2}\phantom{\rule{0ex}{0ex}}\left(2\right)B{\omega}^{2}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{3}{2}B\omega {l}^{2}\phantom{\rule{0ex}{0ex}}\left(4\right)Zero$

PhysicsNumerical Questions(2 marks)

^{19}Hz in free space.1.5×10is placed at the centre, find the force experienced by the test charge.^{-9}CThe arm PQ of the rectangular conductor is moved from x=0, outwards. The uniform magnetic field is perpendicular to plane and exerts from x=0 to x=b and is 0 for x > b. Only the arm PQ possess substantial resistance r. Consider the situation when the arm PQ is pulled outward from x = 0 to x= 2b, and is then moved back to x=0 with constant speed v. Obtain expression for the flux, induced emf, the force necessary to pull the arm and the power dissipated as joule heat. Sketch the variation of these quantities with distance.

2 identical loops are of copper and d other of aluminium r rotated wid same angular speed in d same magnetic field compare

i) induced EMF ii)current produced in 2 coils

justify ur answer

A metallic rod of length l is rotating with an angular frequency w(omega) with one end hinged at the centre and other end at the circumference of a circular metallic ring of radius l about an axis passing through the centre & perpendicular to the plane of rotation. A uniform magnetic field of B tesla is perpendicular to the plane of rotation every where. Find the emf between the centres and the metallic ring.how to make project on mutual induction?

Two identical loops, one of copper and other of aluminium are rotated with the same angular speed in the magnetic field.Compare 1) induced emf 2) the current prodeuced in two coils. Justify your answer.

falling under gravity in a region having a magnetic field. If z is the

vertical direction, the z-component of magnetic field is B

_{z}= B_{o}(1+λ z). If R is the resistance of the ring and if the ring falls with a

velocity v, find the energy lost in the resistance. If the ring has

reached a constant velocity, use the conservation of energy to

determine v in terms of m, B, λ and acceleration due to gravity g.

A conducting rod of length L with one end pivoted is rotated with uniform angular speed W in a vertical plane normal to the magnetic field B.Deduce an expression for emf induced in this rod.?plz answer this question as soon as possible and if possible plz answer the question today only..plz plz plz...

A long solenoid with 15 turns per cm has a small loop of area 2.0 cm

^{2 }placed inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0 A to 4.0 A in 0.1 s, what is the induced emf in the loop while the current is changing?WHAT IS A CHOKE COIL?? ITS ADVANTAGES AND APPLICATION

a, P b. Q c, L d. M

^{2}completely surrounds another coaxial solenoid of the same length , area of cross section 25 cm^{2}with 25 turns per cm . calculate the mutual inductance of the system ?Derivation for Energy Stored in an INDUCTOR

vwhile ring rotates in its COM frame with angular velocity ω. The magnitude of induced EMF between pts O & P is?1. Find the Given Parameter when straight conductor moves in external magnetic field :-

What is motional E.M.F? Derive expression for it.

Electromagnets are made of soft iron because soft iron has:

low retentivity and high coercive force

high retentivity and high coercive force

low retentivity and low coercive force

high retentivity and low coercive force

Kindly explain the answer also.

what is the dimention formula of induced emf

A solenoid have the self inductance 2H.If length of the solenoid is doubled having turn density and area constant then new self inductance is:-

(1)4 H

(2) 1 H

(3) 8 H

(4) 0.5 H

Could you please derive the mutual induction and self induction for a conductor?

the equivalent inductance of two inductors is 2.4 H when connected in parallel and10 H when connected in series .The difference between two inductance is(neglecting mutual induction between coils)

Define fringe width, Derive an expression for fringe width in youngâ€™sdouble slitexperiment.4. Two co-axial solenoids shown in figure. If key of primary suddenly opened then direction of instantaneous induced current in resistance 'R' which connected in secondary :

factors on which mutual inductance of two coils depends

why is spark produced in the switch of a fan ,when it is switched off?

An average induced e.m.f of 0.4V appears in a coil when the current in it is changed from 10 A in one direction to 10 A in opposite direction in 0.4 second.find the coefficient of self induction of the coil.

A simple pendulum with bob of mass m and conducting wire of length L swings(is hanging ) under gravity thro' an angle 2theetha.

The earth's magnetic feild component in the direction perpendicular to swing is B.

the max potential diff induced across pendulum is?

http://www.merit nation.com/cbse/class12-sc ience/textbook solutions/physics/hc-ver ma---ii/electromagnetic-ind uction/page304 -obje ctive-i-q no1/14 03_6941_7 4996/SPECIFIC DOUBT: de=bvl=bwxdx in this wx will represent v that i agree but where did from dx come what do it represent , not l obviously as it is the small length of the small element , shud not there be x instead of dx in ans3. A conductor of length 0.5 m situated in and at right angles to a uniform magnetic field of 1 T moves with a velocity of 40 m/s. Calculate the emf induced in the conductor. What will be the emf induced if the conductor moves at an angle of 60° to the field?

A metallic rod of length l is rotated at a constant angular speed omega, normal to a uniform magnetic field B. Derive an expression for the current induced in the rod, if the resistance of the rod is R.

Answer is (4) plz tell the reason

Prove that E=1/2LI^2

Ris rotated with an angular velocity ω perpendicular to the plane of a magnetic fieldBas shown in the figure. Emf induced in the loop is(1)

BωR^{2}(2) $\frac{1}{2}B\omega {R}^{2}$ (3) $\frac{3}{2}B\omega {R}^{2}$ (4) $\frac{1}{4}B\omega {R}^{2}$a coil having L = 2 mH current flowing through it is I = t

^{2 }e^{-t }then the time at which emf become 0Q4. A copper coil

Lwound on a soft iron core and a lampBare connected to a batteryEthrough a tapping keyK.When the key is closed, the lamp glows dimly. But when the key is suddenly opened, the lamp flashes for an instant to much greater brightness.Explain why?A horizontal straight wire 10m long extending from east to west is falling with a speed of 5m pert sec.at right angles to the horizontal componen of the earths magnetic field 0.3 X 10 n^ -4

I know the answer to emf induced

Please in detail xplain me how to use flemings right hand rule here Becoz only direction of force is known i.e downward .. which is at high potential and why !!M not clear !

^{6}m/s, and_{92}U^{238}undergoing α- decay is 4.5×10^{9}years. What is the activity of 1g sample of_{92}U^{238}?When a resistance of 15Ω is connected in series with ‘Y’, the null point is found to shift by 10cm towards the end A of the wire. Find the position of null point if a resistance of 30Ω were connected in parallel with ‘Y’.

_{1}and E_{2}are connected together in two ways shown here.The 'balance points' in a given potentiometer experiment for these two combinations of cells are found to be at 351.0cm and 70.2cm respectively. Calculate the ratio of the emfs of the two cells.

a)current will decrease

2)current will increase

3)current will remain the same..

i didn't understand how to apply lenz law in this prblm..

why do there is no deflection in galvanometer when the bar magnet is stationary in coil??

(Answer 2L)

S.H.M is 2.5 J, when its displacement is half

of amplitude. The total energy of the particle

is

(A) 2.5 J (B) 10 J

(C) 12 J (D) 20 J

plz...i can't undrstd working of a.c generator??