Capacitance (The Combination of Capacitors in Series and Parallel...) NEET Questions

Physics - Electrostatics

Capacitance (The Combination of Capacitors in Series and Parallel...) MCQ Questions


13.
Outside the plates of a parallel plate capacitor (in regions above and below), the electric field is:
A.
2σ/ε₀
B.
σ/ε₀
C.
Zero
D.
σ/(2ε₀)
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ANSWER :
C. Zero
14.
In a parallel plate capacitor, doubling the area A while keeping d constant:
A.
Doubles the capacitance
B.
Halves the capacitance
C.
Has no effect
D.
Quadruples the capacitance
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ANSWER :
A. Doubles the capacitance
15.
In a parallel plate capacitor, doubling the separation d while keeping A constant:
A.
Halves the capacitance
B.
Doubles the capacitance
C.
Quadruples the capacitance
D.
Has no effect
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ANSWER :
A. Halves the capacitance
16.
A parallel plate capacitor has plate area 1 m² and separation 1 mm with vacuum between plates. Its capacitance is approximately:
A.
8.85 × 10⁻³ F
B.
8.85 × 10⁻⁹ F
C.
8.85 × 10⁻¹² F
D.
8.85 × 10⁻⁶ F
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ANSWER :
B. 8.85 × 10⁻⁹ F
17.
To make a 1 F parallel plate capacitor with d = 1 cm separation, the plate area required is approximately:
A.
10⁹ m² (about 30 km × 30 km)
B.
10¹² m²
C.
10⁵ m²
D.
1 m²
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ANSWER :
A. 10⁹ m² (about 30 km × 30 km)
18.
The 'fringing of field' in a parallel plate capacitor refers to:
A.
Uniform field everywhere between plates
B.
Field reversal at the centre
C.
The bending outward of field lines at the edges of the plates
D.
Field cancellation between plates
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ANSWER :
C. The bending outward of field lines at the edges of the plates