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

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bB = eE/V

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cE = BV

✓


dE = BeV/2

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View Answer E = BV

The standard vector symbol for flux density is ____________________?


aM

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bL

✓


cH

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dB

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View Answer L

SI unit of flux density is____________________?


aNA-1m-1

✓


bNAm-1

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cNmA-1

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dNmA-2

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View Answer NA-1m-1

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


a1T = 103 G

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b1T = 10-4 G

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c1T = 10-2 G

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d1T = 104 G

✓


View Answer 1T = 104 G

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


aair

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bsteel

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cCu-Ni alloy

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dsoft iron

✓


View Answer soft iron

A magnetic field___________________?


aalways exerts a force on a charged particle

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bnever exerts a force on a charged particles

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

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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

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chave no effect upon each other

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dthey cancel out their individual magnetic fields

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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

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b10A

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c100A

✓


d1000A

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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

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bmagnetic field intensity

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cmagnetic induction

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dself inductance

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View Answer magnetic induction

The net charge on n-type material is____________________?


aPositive

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bNegative

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cBoth positive and negative

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dNeutral

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View Answer Neutral

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