Physics MCQs

Page No. 50

The sensitivity of a galvanometer is given by__________________?


aC/BAN


bCAN/B


cBAN/C


dABC/N


View Answer C/BAN

The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________?


a18Ω


b30Ω


c24Ω


d12Ω


View Answer 12Ω

The magnetic field strength of solenoid is__________________?


aB = μNI


bB = μN/I


cB = μnI


dBoth B and C


View Answer Both B and C

Value of permeability of free space in SI units is___________________?


a4πx10-9 WbA-1m-1


b 4πx10-7 WbA-1m-1


c4πx10-10 WbA-1m-1


d4πx10-8 WbA-1m-1


View Answer 4πx10-7 WbA-1m-1

The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________?


aa circle


ba spiral


can ellipse


dhelix


View Answer helix

Magnetic flux and flux density are related by___________________?


amagnetic flux = flux density / area


bmagnetic flux = flux density x area


cflux density = magnetic flux area


dflux density = magnetic flux x area



If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?


aτ = NIAB cosφ


b τ = NIAB sinφ


cτ = NIAB tanφ


dτ = NIAB


View Answer τ = NIAB

A magnetic compass will be deflected if it is kept near a____________________?


acharge in motion


bcharge at rest


cboth


dnone


View Answer charge in motion

When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius___________________?


aR=qB/mV


bR=mV/qB


c R=qmV/B


dR=qmB/V


View Answer R=mV/qB

A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?


aF=1/B


b F=1/Bsinθ


c F/0


dF=1/Bcosθ


View Answer F/0

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