1. Electric potential due to a point charge varies as :
(a) r
(b) r2
(c) 1/r
(d) 1/r2
2. Electrostatic potential is a:
(a) number
(b) vector
(c) tensor
(d) scalar
3. Electric intensity is a :
(a) scalar
(b) vector
(c) tensor
(d) number
4. Charges +2, – 4, + 8 and – 6 e.s.u. are placed at the four corner of a square of side 2 cm. The potential in e.s.u. at the centre of the square is:
(a) zero
(b) 20/ √2
(c) 16/ √2
(d) 12/ √2
5. Principal of superposition is applied to obtain the resultant of two or more forces due to point charges or linear surface space (volume) distribution of charges. Using this principal the magnitude of the resultant of three electrical forces 2F, F0 and F acting on a single charged particle, where F0 2F = 2F2 and F0 = 2FI , is
(a) F + F0
(b) [F2 + F02]1/2
(c) F √ 5
(d) F √ 7
6. The charge of the electron in coulombs is :
(a) + 4.8 x 10–10
(b) – 4.8 x 10–10
(c) + 1.6 x 10–10
(d) – 1.6 x 10–10
7. The electric filed intensity due to a point charge varies with the distance r from the charge as :
(a) 1/r
(2) 1/r2
(c) 1/r3
(d) 1/r4
8. A body carrying a net negative charge of coulomb has an excess of the flowing number of electrons:
(a) 9 x 102
(b) 3 x 1018
(c) 6.24 x 1018
(d) 1.602 x 1019
9. The total capacity of four equal condensers will be maximum when they are connected :
(a) all in series
(b) all in parallel
(c) partly in parallel and partly in series
(d) individually
10. Four condensers of capacities 4,6,8 and 16 microfarads are to be connected to a 1600 volts a.c. source. Each condensers can tolerate only 400 volts. This can be done without the damage in the circuit by connection:
(a) all condensers in series
(b) all condensers in parallel
(c) two in parallel and two in series
(d) three in parallel and one in series
Answer Keys:
1. (c) 2. (d) 3. (b) 4. (a) 5. (d) 6. (d) 7. (b) 8. (c) 9. (b) 10. (a)
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