In the figure, two positive charges q2 and q3 fixed along the y-axis, exert a net electric force in the +x-direction on a charge q1 fixed along the x-axis. If a positive charge Q is added at (x, 0), the force on q1

1. shall increase along the positive x-axis.

2. shall decrease along the positive x-axis.

3. shall point along the negative x-axis.

4. shall increase but the direction changes because of the intersection of Q with q2 and q3.

Subtopic: Â Coulomb's Law |
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A positive charge Q is uniformly distributed along a circular ring of radius R. A small test charge q is placed at the centre of the ring. Then,

 a. if q > 0  and is displaced away from the centre in the plane of the ring, it will be pushed back towards the centre. b. if q < 0 and is displaced away from the centre in the plane of the ring, it will never return to the centre and will continue moving till it hits the ring. c. if q < 0, it will perform SHM for small displacement along the axis. d. q at the centre of the ring is in an unstable equilibrium within the plane of the ring for q > 0.

1. (a, b, c)

2. (a, c, d)

3. (b, c, d)

4. (c, d)

Subtopic: Â Coulomb's Law |
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