Electric Field (Electric field due to a Point Charge, Electric Field Lines... ) NEET Questions

Physics - Electrostatics

Electric Field (Electric field due to a Point Charge, Electric Field Lines... ) MCQ Questions


7.
Two point charges +Q and -Q are placed at distance d apart. The electric field at the midpoint of the line joining them is:
A.
kQ/d² directed from -Q to +Q
B.
8kQ/d² directed from +Q to -Q
C.
2kQ/d²
D.
Zero
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ANSWER :
B. 8kQ/d² directed from +Q to -Q
8.
The direction of electric field at a point due to a negative point charge is:
A.
Tangential to the radius
B.
Radially inward toward the charge
C.
Radially outward from the charge
D.
Zero everywhere
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ANSWER :
B. Radially inward toward the charge
9.
For a system of n charges, the electric field at any point is determined by which principle?
A.
Quantisation of charge
B.
Gauss's law only
C.
Superposition principle
D.
Conservation of charge
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ANSWER :
C. Superposition principle
10.
A charge of 10 μC is placed at origin. The magnitude of electric field at point (3, 4, 0) m is:
A.
1800 N/C
B.
9000 N/C
C.
3600 N/C
D.
900 N/C
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ANSWER :
C. 3600 N/C
11.
Which of the following is NOT a property of electric field lines?
A.
Field lines start from positive charges and end at negative charges
B.
Two field lines can intersect each other
C.
In charge-free region, field lines are continuous curves
D.
Electrostatic field lines do not form closed loops
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ANSWER :
B. Two field lines can intersect each other
12.
Electric field lines are crowded in a region where:
A.
Electric field is weak
B.
Field is uniform
C.
Electric field is strong
D.
There are no charges
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ANSWER :
C. Electric field is strong