- 1(current)
Q. No.In the figure given below, two positive charges \(q_2\) and \(q_3\) fixed along the \(y\)-axis, exert a net electric force in the \(+x\text-\)direction on a charge \(q_1\) fixed along the \(x\)-axis. If a positive charge \(Q\) is added at \((x, 0),\) the force on \(q_1\):
| 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 \(q_2\) and \(q_3\). |
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,
Choose the correct statement(s):
1. (a), (b), (c)
2. (a), (c), (d)
3. (b), (c), (d)
4. (c), (d)
| (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 |
 51%
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