Electric Current - Questions & Answers | Exam2Win

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16. The drift velocity of an electron is the velocity

A. super imposed on random motion

B. in the absence of electric field

C. due to magnetic field

D. in the direction of electric field

Explanation:

17. The electromotive force

A. is a force

B. is work done

C. produces free electrons

D. is an electric field produced by current flow

Explanation:

18. The maximum speed of free electrons in metal is of the order of

A. 109 cm/s

B. 107 cm/s

C. 106 m/s

D. 105 cm/s

Explanation:

19. The electric current is due to

A. random motion of electrons

B. drift velocity of electrons

C. Coulomb force between electrons and proton

D. repulsive force between free electrons and other electrons in an atom

Explanation:

20. The external force that makes the free electrons to move in a conductor is

A. magnetic force

B. Lorentz force

C. Coulomb’s force

D. electromotive force

Explanation:

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