Entry Test MCQ :: Electrostatics

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21.

Potential difference is the work done in moving unit positive charge form one point to another

A.	in the direction of electric intensity	B.	against electric intensity
C.	in any direction	D.	in the direction of electric flux

22.

Equipotential planes are

A.	parallel to one another	B.	non parallel to one another
C.	intersecting	D.	circular

23.

The value of the capacitance depends upon the

A.	voltage applied	B.	thickness of the capacitor plates
C.	geometry of the capacitor	D.	dinsity of the capacitor plates

24.

A 25eV electron has a speed of

A.	2 x 106m/sec	B.	3 x 106m/sec
C.	5 x 106m/sec	D.	4 x 106m/sec

25.

A 5 ?F capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is

A.	2.5 x 10-8 C	B.	10-5 C
C.	103 C	D.	4 x 103 C

26.

capacitor is to have an energy content of 20J it must be placed across a potential difference of

A.	4 volts	B.	9 volts
C.	2 volts	D.	1 vol

27.

Equivalent capacitance is greater than individual capacitances in

A.	series combination	B.	parallel combination
C.	both series and parallel combinations	D.	none of above

28.

Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be

A.	positively charged	B.	electrically neutral
C.	negatively charged	D.	positively and negatively charged

29.

The number of electrons in one coulomb charge is equal to

A.	6.2 x 1018	B.	1.6 x 1019
C.	6.2 x 1021	D.	1.6 x 10-27

30.

In a non-uniform electric field a polar molecule will experience

A.	Net torque	B.	Net force
C.	both series and parallel combinations	D.	zero