Conductors and Insulators , Dielectrics and Electric Polarization NEET Questions

Physics - Electrostatics

Conductors and Insulators , Dielectrics and Electric Polarization MCQ Questions


13.
In a charged conductor in electrostatic equilibrium, excess charge resides:
A.
At the centre
B.
On the inner cavity surface
C.
Only on the outer surface
D.
Uniformly throughout the volume
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ANSWER :
C. Only on the outer surface
14.
The electrostatic potential throughout the volume of a conductor in equilibrium is:
A.
Maximum at centre, minimum at surface
B.
Zero everywhere
C.
Variable, depending on position
D.
Constant (same value as on the surface)
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ANSWER :
D. Constant (same value as on the surface)
15.
Electric field just outside the surface of a charged conductor with surface charge density σ is:
A.
Zero
B.
E = σ/ε₀, normal to the surface
C.
E = σ/(2ε₀), normal to surface
D.
E = σε₀, tangential
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ANSWER :
B. E = σ/ε₀, normal to the surface
16.
If σ > 0 on a conductor's surface, the electric field just outside is directed:
A.
Zero
B.
Inward, toward the surface
C.
Outward, away from the surface
D.
Tangential to the surface
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ANSWER :
C. Outward, away from the surface
17.
Electrostatic shielding refers to the fact that:
A.
A conductor blocks all electromagnetic waves
B.
The electric field inside a cavity of a conductor is zero, irrespective of external fields
C.
Charges can pass through cavities freely
D.
An insulator absorbs electric charges
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ANSWER :
B. The electric field inside a cavity of a conductor is zero, irrespective of external fields
18.
Electrostatic shielding is used to:
A.
Increase the strength of an electric field
B.
Conduct electricity more efficiently
C.
Generate static electricity
D.
Protect sensitive instruments from outside electrical influence
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ANSWER :
D. Protect sensitive instruments from outside electrical influence