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Q. No.Two charges \(\pm10~\mu\text{C}\) are placed \(5.0\) mm apart. The electric field at a point \(P\) on the axis of the dipole \(15\) cm away from its centre \(O\) on the side of the positive charge, as shown in the figure is:
1. \(2.7\times10^5~\text{NC}^{-1}\)
2.
The magnitude of electric field intensity at a distance \({R}~({R}>>{L})\) varies as:
| 1. | \(\frac{1}{{R}^{6}}\) | 2. | \(\frac{1}{{R}^{2}}\) |
| 3. | \(\frac{1}{{R}^{3}}\) | 4. | \(\frac{1}{{R}^{4}}\) |
An electric dipole is placed in a uniform electric field. The net electric force on the dipole:
| 1. | is always zero. |
| 2. | depends on the orientation of the dipole. |
| 3. | can never be zero. |
| 4. | depends on the strength of the dipole. |
An electric dipole is placed at an angle of \(30^\circ\) with an electric field intensity \(2\times10^5~ \text{N/C}\). It experiences a torque equal to \(4 ~\text{N-m}\). The charge on the dipole, if the dipole length is \(2~ \text{cm}\), is:
| 1. | \(8~\text{mC}\) | 2. | \(2~\text{mC}\) |
| 3. | \(5~\text{mC}\) | 4. | \(7~\mu \text{C}\) |
1. \(3\sqrt3\)
2. \(\frac{3\sqrt3}{2}\)
3. \(\sqrt3\)
4. \(\frac{\sqrt3}{2}\)
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Q. No.
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