Electricity and Magnetism AFCAT Questions

AFCAT Physics

Electricity and Magnetism MCQ Questions


7.
Two charges of +2C and -3C exert a force F on each other. If the medium between them is changed from vacuum to a medium of dielectric constant 6, the new force is:
A.
F/36
B.
6F
C.
F/6
D.
36F
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ANSWER :
C. F/6
8.
The electrostatic force between two charges 1 m apart in vacuum, each of 1 Coulomb, is:
A.
9 × 10⁻⁹ N
B.
9 × 10⁶ N
C.
9 × 10⁹ N
D.
1 N
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ANSWER :
C. 9 × 10⁹ N
9.
Coulomb's law is valid for:
A.
Point charges at rest
B.
Magnetic poles
C.
Moving charges only
D.
Neutral particles
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ANSWER :
A. Point charges at rest
10.
The charge on an electron is:
A.
-9.1 × 10⁻³¹ C
B.
-1.6 × 10⁻¹⁹ kg
C.
-1.6 × 10⁻¹⁹ C
D.
+1.6 × 10⁻¹⁹ C
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ANSWER :
C. -1.6 × 10⁻¹⁹ C
11.
Quantization of electric charge means:
A.
Charge can be any value
B.
Charge is continuous
C.
Charge depends on temperature
D.
Charge exists in integral multiples of e
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ANSWER :
D. Charge exists in integral multiples of e
12.
Two identical charges repel each other with a force of 100 N when placed 0.5 m apart. The magnitude of each charge is approximately:
A.
5 × 10⁻⁴ C
B.
1.67 × 10⁻³ C
C.
5.27 × 10⁻⁵ C
D.
1.67 × 10⁻⁴ C
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ANSWER :
D. 1.67 × 10⁻⁴ C