Physics MCQs

Page No. 52

An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________?


aE = BeV


bB = eE/V


cE = BV


dE = BeV/2


View Answer E = BV

The standard vector symbol for flux density is ____________________?


aM


bL


cH


dB


View Answer L

SI unit of flux density is____________________?


aNA-1m-1


bNAm-1


cNmA-1


dNmA-2


View Answer NA-1m-1

The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?


a1T = 103 G


b1T = 10-4 G


c1T = 10-2 G


d1T = 104 G


View Answer 1T = 104 G

Which one of the following material is most suitable for making core of an electromagnet ?


aair


bsteel


cCu-Ni alloy


dsoft iron


View Answer soft iron

A magnetic field___________________?


aalways exerts a force on a charged particle


bnever exerts a force on a charged particles


cexerts a force if the charged particle is moving in the direction of the magnetic field lines


dexerts a force if the charged particle is moving perpendicular to the magnetic field lines



Two parallel wires carrying currents in the opposite directions____________________?


arepel each other


battract each other


chave no effect upon each other


dthey cancel out their individual magnetic fields


View Answer repel each other

What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?


a1A


b10A


c100A


d1000A


View Answer 100A

Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?


amagnetic flux


bmagnetic field intensity


cmagnetic induction


dself inductance


View Answer magnetic induction

The net charge on n-type material is____________________?


aPositive


bNegative


cBoth positive and negative


dNeutral


View Answer Neutral

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