Class 12

20. Current Electricity question bank (Physics)

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Q1.

The drift velocity of electrons in a conducting wire is of the order of 1 mm/s, yet the bulb glows very quickly after the switch is put on because

(A)

The random speed of electrons is very high, of the order of \( 10^6 \, \text{m/s} \)

(B)

The electrons transfer their energy very quickly through collisions

(C)

Electric field is set up in the wire very quickly, producing a current through each cross section, almost instantaneously

(D)

All of above

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Q2.

In the presence of an applied electric field \( \vec{E} \) in a metallic conductor.

(A)

The electrons move in the direction of \( \vec{E} \)

(B)

The electrons move in a direction opposite to \( \vec{E} \)

(C)

The electrons may move in any direction randomly, but slowly drift in the direction of \( \vec{E} \)

(D)

The electrons move randomly but slowly drift in a direction opposite to \( \vec{E} \)

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