In the given circuit if point C is connected to the earth and a potential of +2000 V is given to the point A, the potential at B is:
1. | 1500 V | 2. | 1000 V |
3. | 500V | 4. | 400 V |
The figure shows some of the equipotential surfaces. Magnitude and direction of the electric field is given by:
1. | 200 V/m, making an angle \(120^\circ\)with the x-axis |
2. | 100 V/m, pointing towards the negative x-axis |
3. | 200 V/m, making an angle \(60^\circ\)with the x-axis |
4. | 100 V/m, making an angle \(30^\circ\)with the x-axis |
When a negative charge is released and moves in the electric field, it moves towards a position of:
1. | lower electric potential and lower potential energy. |
2. | lower electric potential and higher potential energy. |
3. | higher electric potential and lower potential energy. |
4. | higher electric potential and higher potential energy. |
In the given figure if , each plate of the capacitor has a surface area of and the plates are apart, then the number of excess electrons on the negative plate is:
1.
2.
3.
4.
The capacitance of a parallel plate capacitor is C. If a dielectric slab of thickness equal to one-fourth of the plate separation and dielectric constant K is inserted between the plates, then the new capacitance will be:
1. | \(KC \over 2(K+1)\) | 2. | \(2KC \over K+1\) |
3. | \(5KC \over 4K+1\) | 4. | \(4KC \over 3K+1\) |
An air capacitor of capacity is connected to a constant voltage battery of 12 V. Now the space between the plates is filled with a liquid of dielectric constant 5. The charge that flows now from battery to the capacitor is:
1. 120
2. 699
3. 480
4. 24
Four equal charges Q are placed at the four corners of a square of each side ‘a’. Work done in removing a charge – Q from its centre to infinity is:
1. 0
2.
3.
4.
Two equal charges q of opposite sign separated by a distance 2a constitute an electric dipole of dipole moment p. If P is a point at a distance r from the centre of the dipole and the line joining the centre of the dipole to this point makes an angle θ with the axis of the dipole, then the potential at P is given by: (r >> 2a) (Where p = 2qa)
1. | \(V={pcos \theta \over 4 \pi \varepsilon_0r^2}\) | 2. | \(V={pcos \theta \over 4 \pi \varepsilon_0r}\) |
3. | \(V={psin \theta \over 4 \pi \varepsilon_0r}\) | 4. | \(V={pcos \theta \over 2 \pi \varepsilon_0r^2}\) |
How much kinetic energy will be gained by an \(\alpha\text-\text{particle}\) in going from a point at \(70~\text{V}\) to another point at \(50~\text{V}\)?
1. | \(40~\text{eV}\) | 2. | \(40~\text{keV}\) |
3. | \(40~\text{MeV}\) | 4. | 0 |
A parallel plate condenser has a capacitance \(50~\mu\text{F}\) in air and \(110~\mu\text{F}\) when immersed in an oil. The dielectric constant \(k\) of the oil is:
1. \(0.45\)
2. \(0.55\)
3. \(1.10\)
4. \(2.20\)