EASY
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IMPORTANT
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An ellipsoidal cavity is carved within a perfect conductor. A positive charge q is placed at the centre of the cavity. The points A and B are on the cavity surface as shown in the figure. 

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Important Questions on Electrostatics

MEDIUM
JEE Main/Advance
IMPORTANT
A battery sets up an electric field of 25 N C-1 inside a uniform wire of length 2 m and resistance of 5 Ω. Find the current through the wire.
EASY
JEE Main/Advance
IMPORTANT

The figure shows the current I in a single-loop circuit with a battery B and resistance R (and wires of negligible resistance). Then find the order of following at the point a, b and c.

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(a) The magnitude of the current,

(b) The electric potential, and

(c) The electric potential energy of the charge carriers (electron), the greatest first.

EASY
JEE Main/Advance
IMPORTANT
A total charge of 20 μC is divided into two parts and placed at some distance apart. If the charges experience maximum Colombian repulsion, the charges should be:
HARD
JEE Main/Advance
IMPORTANT

The magnitude of electric force on 2 μC charge placed at the centre O of two equilateral triangles each of side 10 cm, as shown in the figure is P. If charge A, B, C, D, E and F are 2 μC, 2 μC, 2 μC, -2 μC,  2 μC,  2 μC respectively, then P is:

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EASY
JEE Main/Advance
IMPORTANT
Five balls, numbered 1 to 5, are suspended using separate threads. Pairs (1, 2), (2, 4), (4, 1) show electrostatic attraction, while pairs (2, 3) and (4, 5) show repulsion. Therefore ball 1:
MEDIUM
JEE Main/Advance
IMPORTANT

Two-point charges of the same magnitude and opposite sign are fixed at points A and B. A third small point charge is to be balanced at point P by the electrostatic force due to these two charges. The point P

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EASY
JEE Main/Advance
IMPORTANT

Two-point charges a and b, whose magnitudes are the same are positioned at a certain distance from each other with a at the origin. The graph is drawn between electric field strength at points between a and b and distance x from a. E is taken positive if it is along the line joining from a to b. From the graph, it can be decided that

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HARD
JEE Main/Advance
IMPORTANT
A solid sphere of radius R has a volume charge density ρ = ρ0 r2 (where ρ0 is a constant and r is the distance from centre). At a distance x from its centre (for x<R), the electric field is directly proportional to: