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Syllabus

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

A particle moving with velocity v having specific charge (q/m) enters a region of magnetic field B having d = $\frac{3mv}{5qB}atangleof53\xb0$ to the boundry of magnetic field. Find the angle $\theta $ in the diagram

$1.37\xb0\phantom{\rule{0ex}{0ex}}2.60\xb0\phantom{\rule{0ex}{0ex}}3.90\xb0\phantom{\rule{0ex}{0ex}}4.45\xb0$

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

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%

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

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

4. Five parallel infinite wires are placed at vertices of a regular pentagon. Four wires carry current I

_{0}each while the fifth wire carries current 3I0 shown. The resultant magnetic field at the centre O is :$\left(\mathrm{A}\right)\mathrm{Zero}\left(\mathrm{B}\right)\frac{{\mathrm{\mu}}_{0}{\mathrm{I}}_{0}}{2\mathrm{\pi a}}\left(\mathrm{C}\right)\frac{{\mathrm{\mu}}_{0}{\mathrm{I}}_{0}}{\mathrm{\pi a}}\left(\mathrm{D}\right)\mathrm{Infinite}$

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?

(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) $\frac{{\displaystyle \mathrm{n}{\mu}_{0}\mathrm{I}}}{{\displaystyle \mathrm{\pi a}}}$

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

what is the main difference between solenoid and toroid?

Q.5. A wire of length 'l' carries a current bent into various regular polygons shown below. Find magnetic moment in terms of length of the wire.

(a) Equilateral triangle (b) Square (c) Regular hexagon (c) Circular loop

Q.6. A current carrying wire of length 'l' is bent to form a circular coil of one turn. After that it is again bent to form a circular coil of two turns. Find ratio of magnetic moment of coils respectively.

what r the limitations of cyclotron?

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.

Please give the derivation of Magnetic Field at

1: Axial Position

2: Equatorial Position

Define

dielectric constant of a mediumin terms ofbetweenforceelectric charges._{0}/ 4pi?Q. A rectangular loop ABCD is placed near on infinite length current carrying wire. Magnetic force on the loop is :-

(1) 1.25 x 10

^{-4}N, Attraction (2) 1.25 x 10^{-4}N, Repulsion.(3) 12.5 x 10

^{-4}N, Repulsion (4) 12.5 x 10^{-4}N, Attraction.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?

(1) 53$\xb0$

(2) 37$\xb0$

(3) 30$\xb0$

(4) 0$\xb0$

defnation of ampere's circuital law

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).

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

Q. The time period of a thin bar magnet in earth's magnetic field is T . If the magnet is cut into two equal parts perpendicular to its lenght the time period of the each part in the same will be ..??????????????plz ans it soon..:)

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 ??

A magnetic dipole of dipole moment 10 $\left(\hat{i}+\hat{j}+\hat{k}\right)$ is placed in a magnetic field $0.6\hat{i}+0.4\hat{j}+0.5\hat{k}$, force

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?

1) 2v/B

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

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

The magnitude of velocities at point A, B and C respectively during the motion is :

(1) Maximum at A and C

(2) Maximum at B

(3) Minimum at A and C

(4) Equal at A, B and C

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.

second vessel is expanded adiabatically the sarne extent, then :

(1) In the second vessel, both pressure and work done are more

(2) In the second vessel, pressure in more, but the work done is less.

(3) In the first vessel, both pressure & work done are more.

(4) In the first vessel, pressure is more, but work done is less

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

a charged particle moves in a gravity free space without change in velocity.which of the following is are possible and why?

a.E=0,B=0 b.E=0,B not equal to 0 c.E not equal to zero and B=0 d.E and B BOTH not equal to zero

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

_{2}O_{7, }oxidizes 2 moles of ferrous oxalate in acidic medium, then what is the value of x?ans. 1

plz explain

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

(1) ACW, In horizontal plane

(2) ACW, In vertical plane

(3) CW, In horizontal plane

(4) CW, In vertical plane

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.

(a) $\frac{{\mu}_{o}{I}^{2}}{8\mathrm{\pi}}$

(b) $\frac{{\mu}_{o}{I}^{2}}{16\mathrm{\pi}}$

(c) $\frac{{\mu}_{o}{I}^{2}}{4\mathrm{\pi}}$

(d) $\frac{{\mu}_{o}{I}^{2}}{2\mathrm{\pi}}$

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

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

is the net force on the loop?

Sketch the graph showing variation of resistivity of carbon with temperature

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

Q.A coil of 100 turns kept in magnetic field B- 0.2T, carries a current of 2A as shown in figure. Torque on coil and which side of coil comes out from the plane of the paper :-(1) 0.16 N-m, BC side comes out from plane of paper

(2) 0.16 N-m, AD side comes out from plane of paper

(3) 0.32 N, BC side comes out from plane of paper

(4) 0.32 N, AD side comes out from plane of paper

PLZ ANSWER THIS FOR ME QUICK!!

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

How to Convert, Galvanometer into a Voltmeter?

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

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

a) 2amp b)4amp c)6 amp d)8amp

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?

^{7}ms^{-1}enters midway between two horizontal plates in a direction parallel to plates. plates r 5cm long, 2cm apart & have a p.d V applied between them. cal the value of V if beam is deflected so that it jst grazes the edge of lower plate ? e/m=1.8x10^{11}Ckg^{-1}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.

Q. An electron is projected normally from the surface of a sphere with speed ${v}_{0}$ in a uniform magnetic field perpendicular to the plane of the paper such that its strikes symmetrically opposite on the sphere with respect to the x-axis. Radius of the sphere is 'a' and the distance of its centre from the wall is 'b'. What should be magnetic field such that the charge particle just escapes the wall :-

(1) $B=\frac{2bm{v}_{0}}{\left({b}^{2}-{a}^{2}\right)e}$

(2) $B=\frac{2bm{v}_{0}}{\left({a}^{2}+{b}^{2}\right)e}$

(3) $B=\frac{m{v}_{0}}{\left(\sqrt{{b}^{2}-{a}^{2}}\right)e}$

(4) $B=\frac{2m{v}_{0}}{\left(\sqrt{{b}^{2}-{a}^{2}}\right)e}$