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Syllabus

Explain the principle ,working and construction of moving coil galvanometer.

1) at a point on d axis of d coil at a distance of 40 cm frm its centre n

2) at d centre of d coil

Explain the working and principle of CYCLOTRON!!!WITH DIAGRAM!!

Choose the correct statements:

1) The centripital force on bead from frame of refrence of centre of mass of ring is qv0B

2)mgnetic field B mg/qv0

3) radius of ring=mv0/qB

4)tangential acceleration of bead=qv0Bcos(theta)/qB

what is the proper statement forbiot savart's law?^{-5}N, when kept at a separation of 20 cm in air. Calculate the pole strengths of the two poles.construction and working of moving coil galvanometer

An electron of 40 eV energy is revolving in a circular path in a magnetic field of 9*10^-5T.Determine (i)speed of the electron (ii)radius of the circular path .

ans is (i03.75*10^6m s^-1,(ii)23.7cm

why do we need a radial field in moving coil galvanometer??

an alpha particle is moving along a circle of radius 0.45m in a magnetic field of 12T.Find (i)the speed of the paticle ,(ii)the time period of the particle.(mass of alpha particle is 6.7*10^-27kg).

ans is (i)2.58*10^8m per secs,(ii)1.09*10^-8s

what is current sensitivity nd voltage sensitivity...define maximum

Q - Write the expression for the force acting on a charged particle of charge

(q)moving with a velocity(v) in the presence of magnetic field(B). show that in presence of this force :(i) the Kinetic Energy of particle does not change.

(ii) Instantaneous power is zero.

A CYCLOTRON,S OSCILLATOR FREQUENCY IS 10 MHz. WHAT SHOULD BE THE OPERATING MAGNETIC FIELD FOR ACCELERATING PROTONS? IF THE RADIUS OF ITS DEES IS 60cm, WHAT IS THE KINETIC ENERGY OF THE PROTON BEAM PRODUCED BY THE ACCELERATOR? EXPRESS YOUR ANSWER IN MeV.what is cyclotron and how it works?

What is resonance condition in cyclotron? How is it used to accelerate the charged particles ?

^{-1}. Find : (i) direction and magnitude of the magnetic field due to which the electron will go from A to B on the semi-circular path shown, (ii) time taken by the electron in going from A to B.[Answer: (i) $1.12\times {10}^{-3}T$ , perpendicular to the plane of paper pointing downwards, (ii) $1.57\times {10}^{-8}s.$]

what is the main difference between solenoid and toroid?

Q23. A proton moving towards east in a horizontal plane enters a horizontal magnetic field of 0.34 T directed towards north with speed of 2.0 × 10

^{7}ms^{–1}. Calculate (i) the magnitude and direction of the force on the proton, (ii) radius of proton's path and (iii) the lateral displacement of the proton while moving 0.20 m towards east.Ans. (i) 1.09 × 10

^{–12}N, vertically upwards,(ii) 0.625 m, (iii) 0.032 m (approx).

17 (a) an infinitely long positively charged straight wire has a linear charge density of lamda cm(inverse). and electron is revolving around the wire as its centre with a constant velocity in a circular plane perpendicular to the wire. deduce the expression for its kinetic energy.

(b) plot a graph of the kinetic energy as a function of charge density lamda.

what r the limitations of cyclotron?

an electron accelerated by a potential difference of 300V ,is moving at a distance of 4mm from a long staight wire.If current of 5A flows through the wire,what will be the force acting on the electron?

ans is 4*10^-16N

V

Please give the derivation of Magnetic Field at

1: Axial Position

2: Equatorial Position

^{5}j(m/s) experiences a magnetic force F = 4 x 10^{–5}(–k) N. Find the direction and magnitude of the magnetic fieldDefine

dielectric constant of a mediumin terms ofbetweenforceelectric charges.State Ampere's Circuital Law. Use it to derive the magnetic field along the axis of a current carrying solenoid of length 'l' having 'n' number of turns.

a straight long thick wire of uniform cross section of radius 'a' is carrying a steady current I.use ampere's circuital law to obtain a relation showing the variation of magnetic field (B) inside the wire with distance r , (r<=a) and(r>a) of the field point from the center of its cross section .Plot a graph showing the nature of this variation.

Calculate the ratio of the magnetic field at a point a/2 above the surface of the wire to that at a point a/2 below its surface.What is the max value of the field of this wire?

Calculate the Magnetic field induction at the centre of a coil bent in the form of square of side 10cm carrying current of 10A.

defnation of ampere's circuital law

A current of 5 mili amps passing through a coil of 10 turns produce a magnetic field of 6.28*10

^{-8}Tesla at the center 0f the coil calculate the radius of coil.what is the function of the soft iron core in a moving coil galvanometer

A coil of wire has an area of 600 sq. cm and has 500 turns. If it carries 1.5 A current, its magnetic dipole moment is:-

A weight Mg is suspended from the middle of a rope whose ends are at the same level. The rope is no longer horizontal. The minimum tension required to completely straighten the rope is ????(1) Mg/2 ......(2) Mgcos (theta).......(3) 2Mgcos ( theta) ....(4) Infinitely large......

why magnetic field lines form closed curve ??

what is the intensity of magnetic field at any point on a thin conductor itself due to current carried by it?

If the current sensitivity of a moving coil galvanometer is increased by 20%, its resistance also increases by 1.5 times.How will the voltage sensitivity of galvanometer be affected?

ans is-turns must be increased from 24 to 30;voltage sensitivity will fall by 25%.

1) 2v/B

^{2}R^{2}2)v/2BR

pl show the method.[the ans- (1)]

A coil of N turns and radius R carries a current I. It is unwound and rewound to make another

coil of radius R/2, current remaining the same. Calculate the ratio of the magnetic moment of the

new coil and original coil.

magnetic field lines can be entirely confined within the core of a toroid but not within a straight solenoid. Why?

Please explain me first the meaning of the question and then the answer

Why Biot-Savart Law is only applicable for a symmetrical current distribution?

1. 0.1V/M 2. 1.0V/M 3. 10.0 V/M 4. 100 V/M

state amperes circuital law??????????????

Two identical circular loops, P and Q, each of radius r and carrying currents I and 2I respectively are lying in parallel plans such that they have a common axis.

The direction of current in both the loops is clockwise as seen from center . Find the magnitude of the net magnetic field at the center.

Two point charges, q1 and q2, are located at points (a, o, o) and (o, b, o)

respectively. Find the electric field, due to both these charges, at the point,

(o, o, c).

Solve this :47. A cyclotron accelerating protons has dees of 0.4 m radius and a radio-frequency supply of megacycles/seconds at 5000 volt maximum value. Calculate the magnitude of the required magnetic field, the energy and velocity acquired by the protons. Take protons mass 1.67 * 10

^{-27}kg.placed with its longer side parallel to a long straight conductor 2cm apart carrying of 25A. What

is the net force on the loop?

An electron after being accelerated through a potential difference of 10

^{4}_{ }Volt enters a uniform magnetic field of 0.04T perpendicular to its direction of motion.Calculate the radius of curvature of its trejectory?a current of 10 A is flowing east to west in a long wire kept horizontally in east west direction. find magnetic field and its direction in the horizontal plane at a distance of

(i)10 cm north

(ii) 20 cm south from the wire.

and in the verical plane at a distance of

(i)40 cm downward

(ii)50 cm upward.

what are the application and limitation of ampere's circuital law

Band_{P}Bbe the magnetic field produced by the wire P and Q which are placed symmetrically in a rectangular loop ABCD as shown in figure. Current in wire_{Q}Pis I directed inward and inQis 21 directed outwards. If $\underset{A}{\overset{B}{\int}}{\overrightarrow{B}}_{Q}\xb7\overrightarrow{d\mathcal{l}}=2{\mu}_{0}$ tesla meter, $\underset{D}{\overset{A}{\int}}{\overrightarrow{B}}_{P}\xb7\overrightarrow{d\mathcal{l}}=-2{\mu}_{0}$ tesla meter & $\underset{A}{\overset{B}{\int}}{\overrightarrow{B}}_{P}\xb7\overrightarrow{d\mathcal{l}}=-{\mu}_{0}$ tesla meter the value of I will be:(A) 8 A (B) 4 A (C) 5 A (D) 6 A

Sketch the graph showing variation of resistivity of carbon with temperature

A proton moving in a straight line enters a strong magnetic field along the field line direction. How will its path and velocity change?

what is the SI unit of current sensitivity in moving coil galvanometer?

A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet such that B vector is in plane of the coil. if due to a current i in the triangle a torque torque acts on it, the side l of the triangle is

Which one will experience maximum force when projected with the same velocity 'v' perpendicular to the magnetic field B, alpha particle or beta particle?

How to Convert, Galvanometer into a Voltmeter?

What is pitch of the helical path followed by a charged particle moving along and making an angle θ with the magnetc field ?

velocity v towards East. The vertical component of

earth magnetic field is B and angle of dip is θ. The

induced e.m.f. in rod is

(1) Blv cot θ (2) Blv sin θ

(3) Blv tan θ (4) Blv cos θ

A beam of alpha particles projected along +x axis, experience a force due to magnitic field along the +y axis. What is the direction of the magnetic field?

how to find refractive index of aliquid using plane mirror and convex lens

State two factors on which sensitivity of a moving coil galvanometer depends?

iin the wire having straight and semi-circular portions, as shown.an alpha particle and a proton are released from the centre of the cyclotron and made to accelerate 1. can both be accelerated at the same cyclotron frequency give reason 2.when they are accelerated in turn which of the two will have higher velocity at the exit of the dees.