AIPMT 2010 Prelims | Moving Charges and Magnetism Question 53 | Physics

A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be

900 $$\Omega $$

1800 $$\Omega $$

500 $$\Omega $$

1000 $$\Omega $$

AIPMT 2010 Prelims

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

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

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

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

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

AIPMT 2009

MCQ (Single Correct Answer)

-1

Under the influence of a uniform magnetic field, a charged particle moves with constant speed v in a circle of radius R. The time period of rotation of the particle

depends on R and not on v

is independent of both v and R

depends on both v and R

depends on v and not on R

AIPMT 2009

MCQ (Single Correct Answer)

-1

The magnetic force acting on a charged particle of charge $$-$$2 $$\mu $$C in a magnetic frield of 2 T acting in y direction, when the particle velocity is $$\left( {2\widehat i + 3\widehat j} \right) \times {10^6}\,m{s^{ - 1}}$$

4 N in z direction

8 N in y direction

8 N in z direction

8 N in $$-$$ z direction

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