AIPMT 2012 Prelims | Moving Charges and Magnetism Question 37 | Physics

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

Two similar coils of radius R are lying concentrically with their planes at right angles to each other. The currents flowing in them are $$I$$ and 2$$I$$, respectively. The resultant magnetic field induction at the centre will be

$${{\sqrt 5 {\mu _0}I} \over {2R}}$$

$${{\sqrt 5 {\mu _0}I} \over R}$$

$${{{\mu _0}I} \over {2R}}$$

$${{{\mu _0}I} \over R}$$

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

An alternating electric field, of frequency $$v$$, is applied across the does (radius = R) of a cyclotron that is being used to accelerate protons (mass = m). The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of the proton beam, produced by it, are given by

$$B = {{m\upsilon } \over e}$$ and $$K = 2m{\pi ^2}{\upsilon ^2}{R^2}$$

$$B = {{2\pi m\upsilon } \over e}$$ $$K = {m^2}\pi \upsilon {R^2}$$

$$B = {{2\pi m\upsilon } \over e}$$ $$K = 2m{\pi ^2}{v^2}{R^2}$$

$$B = {{m\upsilon } \over e}$$ $$K = {m^2}\pi \upsilon {R^2}$$

AIPMT 2011 Mains

MCQ (Single Correct Answer)

-1

A galvanometer of resistance, G, is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is

$${G \over {(S + G)}}$$

$${{{S^2}} \over {\left( {S + G} \right)}}$$

$$\left( {{{SG} \over {S + G}}} \right)$$

$${{{G^2}} \over {(S + G)}}$$

AIPMT 2011 Mains

MCQ (Single Correct Answer)

-1

Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency $$f$$ Hz. The magnitude of magnetic induction at the center of the ring is

$${{{\mu _0}qf} \over {2\pi R}}$$

$${{{\mu _0}qf} \over {2R}}$$

$${{{\mu _0}q} \over {2fR}}$$

$${{{\mu _0}q} \over {2\pi fR}}$$

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