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Syllabus

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

Define magnetic inclination and horizontal component os earth's magnetic field at a place.Establish relaation b/w the two with the help of diagram.

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

what is the proper statement forbiot savart's law?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??

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

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 ?

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.

what is the main difference between solenoid and toroid?

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.

number of turns ‘N’ are lying in perpendicular planes such that their centres coincide. Find the magnitude and direction of the resultant magnetic field at the centre of the coils,if they are carrying currents ‘I’ and I/root 3' respectively.

what r the limitations of cyclotron?

Please give the derivation of Magnetic Field at

1: Axial Position

2: Equatorial Position

the horizontal component of earth's magnetic field at a place is 0.4 x 10

^{-4}wb/m^{2}and angle of dip is 30 degrees.caluclate the veritical component and the total intensity of earth's magnetic fieldDefine

dielectric constant of a mediumin terms ofbetweenforceelectric charges.Q.44. If diffraction occurs through a single slit then intensity of first secondary maxima become ............... of central maxima :-

(1) 4%

(2) 25%

(3) 75%

(d) 50%

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.

(1) 400 V, 2 A

(2) 800 V, 2 A

(3) 100 V, 2 A

(3) 100 V, 4 A

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?

defnation of ampere's circuital law

what is the function of the soft iron core in a moving coil galvanometer

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......

(1) $\frac{\mathrm{n}{\mu}_{0}\mathrm{I}}{\mathrm{\pi a}}\mathrm{sin}\left(\frac{\mathrm{\pi}}{\mathrm{n}}\right)\mathrm{cot}\left(\frac{\mathrm{\pi}}{\mathrm{n}}\right)$ (2) $\frac{{\displaystyle \mathrm{n}{\mu}_{0}\mathrm{I}}}{{\displaystyle \mathrm{\pi a}}}\mathrm{cos}\left(\frac{{\displaystyle \mathrm{\pi}}}{{\displaystyle \mathrm{n}}}\right)\mathrm{tan}\left(\frac{{\displaystyle \mathrm{\pi}}}{{\displaystyle \mathrm{n}}}\right)$

(3) $\frac{{\displaystyle \mathrm{n}{\mu}_{0}\mathrm{I}}}{{\displaystyle \mathrm{\pi a}}}\mathrm{sin}\left(\frac{{\displaystyle \mathrm{\pi}}}{{\displaystyle \mathrm{n}}}\right)\mathrm{tan}\left(\frac{{\displaystyle \mathrm{\pi}}}{{\displaystyle \mathrm{n}}}\right)$ (4) $\frac{{\displaystyle \mathrm{n}{\mu}_{0}\mathrm{I}}}{{\displaystyle \mathrm{\pi a}}}$

why magnetic field lines form closed curve ??

A moving coil galvanometer of resistance G gives its full scale deflection when a current Ig flows through its coil. It can be converted into an ammeter of range ( 0 to I)(I>Ig) when a shunt resistance S is connected across its coil. If this galvanometer is converted into an ammeter of range 0 to 2I , find the expression for the shunt required in terms of S and G?

Please help as soon as possible.

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?

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

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

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.

current of 4 A is

why does a moving charge experience a force in a magnetic field?

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).

Answer : 0.41 A, from left to right.

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:-

placed with its longer side parallel to a long straight conductor 2cm apart carrying of 25A. What

is the net force on the loop?

(1) 1

(2) 2

(3) 2.8

(4) 2.5

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

Sketch the graph showing variation of resistivity of carbon with temperature

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

$Answer:3.0\times {10}^{-5}N,towardsB.$

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

^{o}C and then cooled in a magnetic field free space. Will it retain magnetism? Give reason.How to Convert, Galvanometer into a Voltmeter?

A galvanometer of resistance 80 ohm ,shunted by a resistance 20 ohm is joined in series with a resistance 200 ohm and a cell 1.5V . what is the sensitivityof the galvanometer if it shows a deflection of 30 divisions .

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

Q13. A current of i ampere is flowing through the adjoining bent wire. Find the magnitude and direction of the magnetic field at the point O.

$\mathbf{Ans}\mathbf{.}\mathbf{}\mathrm{B}=\frac{{\mu}_{0}i}{8}\left(\frac{1}{{a}_{1}}+\frac{3}{{a}_{2}}\right)$, perpendicular to the page, directed downwards.

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

^{-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) $1.57\times {10}^{-8}s.$]

$\left(a\right)\frac{{\mu}_{0}I}{\sqrt{2}\mathrm{\pi a}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{b}\right)2\sqrt{2}\frac{{\mathrm{\mu}}_{0}\mathrm{I}}{\mathrm{\pi a}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{c}\right)\frac{2{\mathrm{\mu}}_{0}\mathrm{I}}{\mathrm{\pi a}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{d}\right)\mathrm{zero}$

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?

^{2 }and wavelength 5X10^{-7}m is incident on a surface, it is completely absorbed by the surface. If 100 photons emit one electron and area of the surface is 1 cm^{2}, then photoelectric current is :(a) 2 mA (b) 0.4 μA (c) 4.0 mA (d) 4.0 μA

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

what is the relation between between the current and the magnetic moment of a current carrying circular loop ? use this expression derive the relation between the magnetic moment of an electron moving in a circle and its related angular momentum?

Q - A circular coil of N turns and radius 'r' is kept normal in a mgnetic field given by

B = B. Deduce an expression for induced emf in the coil ?_{0 }cosωtPlease help me sir. !!!

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

The magnetic field is linear in the source Idl just as the electrostatic field is linear in its source ie. electric charge. Explain

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

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.