How much kinetic energy will be gained by an – particle in going from a point at 70 V to another point at 50 V ?
(1)
(2)
(3)
(4)
If a charged spherical conductor of radius 10 cm has potential V at a point distant 5 cm from its centre, then the potential at a point distant 15 cm from the centre will be -
(1)
(2)
(3)
(4) 3 V
1. | \(9 \times 10^{-3}~\text{J}\) | 2. | \(9 \times 10^{-3}~\text{eV}\) |
3. | \(2~\text{eV/m}\) | 4. | zero |
An oil drop having charge 2e is kept stationary between two parallel horizontal plates 2.0 cm apart when a potential difference of 12000 volts is applied between them. If the density of oil is 900 kg/m3, the radius of the drop will be -
(1)
(2)
(3)
(4)
The ratio of momenta of an electron and an -particle which are accelerated from rest by a potential difference of 100 volt is
(1) 1
(2)
(3)
(4)
When a proton is accelerated through 1V, then its kinetic energy will be -
(1) 1840 eV
(2) 13.6 eV
(3) 1 eV
(4) 0.54 eV
1. | \(V \neq 0 \text { and } \vec{E} \neq 0\) |
2. | \(V \neq 0 \text { and } \vec{E}=0\) |
3. | \(V=0 \text { and } \vec{E}=0\) |
4. | \(V=0 \text { and } \vec{E} \neq 0\) |
The displacement of a charge Q in the electric field is . The work done is
(1)
(2)
(3)
(4)
Three charges Q, +q and +q are placed at the vertices of a right-angled isosceles triangle as shown. The net electrostatic energy of the configuration is zero if Q is equal to
(1)
(2)
(3) –2q
(4) +q
1. | Electric potential at the surface of the cube is zero. |
2. | Electric potential within the cube is zero. |
3. | Electric field is normal to the surface of the cube. |
4. | Electric field varies within the cube. |