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Electric Charges and Field
1. A soap bubble is given a negative charge,
then its radius
(A) Decreases G
(B) Increases (C) 40 (D) 40 G
(C) Remains unchanged 7. The law, governing the force between electric
(D) Nothing can be predicted as information is charges is known as
insufficient (A) Ampere's law (B) Ohm's law
2. A body can be negatively charged by (C) Faraday's law (D) Coulomb's law
(A) Giving excess of electrons to it
(B) Removing some electrons from it 8. When the distance between the charged particles is
(C) Giving some protons to it halved, the force between them becomes
(D) Removing some neutrons from it (A) One-fourth (B) Half
(C) Double (D) Four times
3. The minimum possible charge on an object is
(A) 1 coulomb
(B) 1 stat coulomb 9. A total charge Q is broken in two parts Q1 and Q2
(C) 1.6 10–19 coulomb and they are placed at a distance R from each other.
(D) 3.2 10–19 coulomb The maximum force of repulsion between them will
occur, when
4. An attractive force between two neutrons is due to Q 2Q
(A) Electrostatic and gravitational (A) Q2 , Q1
3 3
(B) Electrostatic and nuclear
Q
(B) Q2 , Q1
3Q
(C) Gravitational and nuclear
(D) Some other forces like Vander Waals 4 4
Q
(C) Q ,Q 2Q
2
5. Two charges placed in air repel each other by a 4 1 4
force of 10–4. When oil is introduced between the Q Q
charges, the force becomes 2.5 × 10–5 N. The (D) Q1 ,Q2
2 2
dielectric constant of oil is
(A) 2.5 (B) 0.25
(C) 2.0 (D) 4.0 10. Three charges 4 q, Q and q are in a straight line in
the position of O, l/2 and l respectively. The
6. Two particle of equal mass m and charge q are
resultant force on q will be zero, if Q is
placed at a distance of 16 cm. They do not
q
experience any force. The value of is (A) –q (B) –2q
m q
(C) (D) 4q
(A) l (B) 0 2
G
, 2
Answer Key
1. (B)
2. (A)
3. (C)
4. (C)
5. (D)
6. (D)
7. (D)
8. (D)
9. (D)
10. (A)
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