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Syllabus

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

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

a long solenoid with closely wound turn has n turns per unit of its length.a steady current/flow through this solenoid.use ampere circuital law to obtain an expression for the magnetic field at point on its axis and closed to its midpoint.

what is the proper statement forbiot savart's law?construction and working of moving coil galvanometer

x, y, z) is given by $\overrightarrow{B}=\frac{{B}_{0}y}{{\left({x}^{2}+{y}^{2}\right)}^{{\displaystyle \frac{1}{2}}}}\hat{i}-\frac{{B}_{0}x}{{\left({x}^{2}+{y}^{2}\right)}^{\frac{1}{2}}}\hat{j}$. Find current enclosed in the loopx^{2}+y^{2}^{ }=r^{2}.(1) $\frac{{B}_{0}r}{{\mu}_{0}}$ (2) $\frac{2{B}_{0}r}{{\mu}_{0}}$ (3) $\frac{2\pi {B}_{0}r}{{\mu}_{0}}$ (4) $\frac{{B}_{0}r}{2{\mu}_{0}}$

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

$1.BI\mathcal{l},along+zdirection\phantom{\rule{0ex}{0ex}}2.2BI\mathcal{l},along+zdirection\phantom{\rule{0ex}{0ex}}3.BI\mathcal{l},along-zdirection\phantom{\rule{0ex}{0ex}}4.2BI\mathcal{l},along-zdirection$

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.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

what is cyclotron and how it works?

Ris having current per unit area (J) as $J=\frac{\alpha r}{R}$ where α is constant andris distance from axis. Find magnetic field at distancexfrom axis of wire. Assumex>R.(1) $\frac{{\mu}_{0}\alpha {R}^{2}}{3x}$ (2) $\frac{{\mu}_{0}\alpha {R}^{2}}{2x}$

(3) $\frac{{\mu}_{0}\alpha {R}^{2}}{x}$ (4) Zero

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

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?

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.

what r the limitations of cyclotron?

Please give the derivation of Magnetic Field at

1: Axial Position

2: Equatorial Position

(i) magnitude and direction of the net magnetic field at point A lying on conductor 1,

(ii) magnetic force on conductor 2.

Define

dielectric constant of a mediumin terms ofbetweenforceelectric charges.$Answer:3.0\times {10}^{-5}N,towardsB.$

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 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:-

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......

why magnetic field lines form closed curve ??

magnitude of the maximum torque?

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?

Bat the centre of the are. (a) What is the magnetic field due to the straight segments? (b) In what way the contribution toBfrom the semicircle differs from that of a circular loop and in what way does it resemble? (c) Would your answer be different if the wire were bent into a semi-circular arc of the same radius but in the opposite way as shown in Fig. 4.13(b)?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

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

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

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

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

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.

A set of 4 cells each of emf 2V and internal resistance 1.5 ohm are connected across external load of 10 ohm with two raw cells in each branch. Calculate the current in each branch and potential difference across 10 ohm.

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).

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

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

Sketch the graph showing variation of resistivity of carbon with temperature

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

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

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?

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?

Q). Obtain with the help of necessary diagram, the expression for the magnetic field in the interior of a toroid carrying current.

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%

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?

ans= (10μ0i/R)ln2..........how??

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.