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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 connectedORwhat is displacement current????

what is conduction current???

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

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

self induction is called the inertia of electricity.why?

^{o}about it's one of the diameters in 2 seconds. Find the rate of change of magnetic flux through the coil.show that lenz's law is in accordance with the law of conservation of energy???

44. In the last problem (i.e., Q. 43), the wire is shaped like a parabola y

^{2}^{ }= 4ax, at the instant the rod crosses the point (a, 0). Induced emf in the rod is(1) Bav (2) 2Bav

(3) 3Bav (4) 4Bav

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.

1. Find the Given Parameter when straight conductor moves in external magnetic field :-

Why a transformer cannot step up dc voltage?

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

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

^{2}. Its plane is kept perpendicular to a magneticfield of 0.3 Wb m

^{–2}and is rotated through 180°. Calculate the change in magnetic flux.can any please xplain ac generator?

A starter motor of the car draws a current i=300A from the battery of voltage 12V. If the car starts only after 12min, what is the energy drawn from the battery.

_{0}out of the page, find emf developed between two points of rod./$\left(1\right)\frac{1}{2}B\omega {l}^{2}\phantom{\rule{0ex}{0ex}}\left(2\right)B{\omega}^{2}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{3}{2}B\omega {l}^{2}\phantom{\rule{0ex}{0ex}}\left(4\right)Zero$

description about dead beat galvanometer

For circuits for transporting electric power, a low power factor implies large power loss in transmission line. Why?

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

two resistance 5ohm and 7ohm are joined as shown to two batteries of emf 2V and 3V . ifhe 3V battery is short circuited. what will be the current through 5ohm ?

1 Find the direction of induced current for the given cases:-

(Where w.r.t= with respect to time and ob=observer)

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}C2 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

Q4. 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 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.(i) magnetic flux (?) through the loop with time (t).

(ii) induced emf (?) in the loop with time t.

(iii) induc ed current in the loop if it has resistance of 0.1 ?.

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

The magnitude of the emf induced in the wire is____i____, while the direction of the current induced in the jumper is from_____ii____.

The alternative that complete the given statement is

^{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 ?answer fast please

Derivation for Energy Stored in an INDUCTOR

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

^{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 15â„¦ 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 30â„¦ 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.

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

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.

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

the peak value of emf in ac is E0. write its rms and average value over a complete cycle.

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

1.A coil is mechanically rotated with constant angular speed (w) in a uniform magnetic field which is parallel to the axis of rotation of the coil, the plane of the coil initially held perpendicular to the field. Plot a trap showing variation of 1. Magnetic flux 2. The induced emf in the coil as a function of (wt).

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.factors on which mutual inductance of two coils depends

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

NO ONE ANSWERED MY QUESTION??

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?

The 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.

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.

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) $\frac{1}{4}B\omega {R}^{2}$define 'time constant' of an L-R circuit . what is it MKS unit?

a coil having L = 2 mH current flowing through it is I = t

^{2 }e^{-t }then the time at which emf become 0A 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 !

Problem 5: A thin hollow cylinder of radius a is surrounded co-axially by another hollow cylinder of radius b, where b > a. Both the cylinders form part of an electric circuit and a current I flows through them as shown in the figure. Find the

(a) self inductance per unit length.

(b) magnitude of the pressure exerted on each cylinder and state whether. the force on each cylinder is tending to burst apart or to collapse the cylinder

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..

(Answer 2L)

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