Q. No.A parallel plate air capacitor is charged to potential difference V. After disconnecting the battery, the distance between the plates of the capacitor is increased using an insulating handle. As a result the potential difference between the plates:
1. decreases.
2. increases.
3. becomes zero.
4. does not change.
In a certain region of space with volume \(0.2\) m3, the electric potential is found to be \(5\) V throughout. The magnitude of electric field in this region is:
1. \(0.5\) N/C
2. \(1\) N/C
3. \(5\) N/C
4. zero
A short electric dipole has a dipole moment of \(16 \times 10^{-9} ~\text{C-}\text{m}\). The electric potential due to the dipole at a point at a distance of \(0.6~\text{m}\) from the centre of the dipole situated on a line making an angle of \(60^{\circ}\) with the dipole axis is: \(\left( \frac{1}{4\pi \varepsilon_0}= 9\times 10^{9}~\text{N-m}^2/\text{C}^2\right)\)
1. \(200~\text{V}\)
2. \(400~\text{V}\)
3. zero
4. \(50~\text{V}\)
The capacitance of a parallel plate capacitor with air as a medium is \(6~\mu\text{F}\). With the introduction of a dielectric medium, the capacitance becomes \(30~\mu\text{F}\). The permittivity of the medium is:\(\left(\varepsilon_0=8.85 \times 10^{-12} ~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\right )\)
| 1. | \(1.77 \times 10^{-12}~ \text{C}^2 \text{N}^{-1} \text{m}^{-2}\) |
| 2. | \(0.44 \times 10^{-10} ~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\) |
| 3. | \(5.00 ~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\) |
| 4. | \(0.44 \times 10^{-13} ~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\) |
Two condensers of capacity 0.3 and 0.6 are connected in series. The combination is connected across a potential of 6 V. The ratio of energies stored by the condensers will be:
1.
2. 2
3.
4. 4
The electric potential difference between two parallel plates is \(2000 ~\mathrm V\). If the plates are separated by \(2~ \mathrm {mm}\), what is the magnitude of the electrostatic force on a charge of \(4 \times 10^{-6}~ \mathrm C\)located midway between the plates?
| 1. | \(4~\mathrm N\) | 2. | \(6~\mathrm N\) |
| 3. | \(8~\mathrm N\) | 4. | \(1.5 \times 10^{-6}~ \mathrm N\) |
The increasing order of the electrostatic potential energies for the given system of charges is given by:
| 1. | a = d < b < c | 2. | b = d < c < a |
| 3. | b = c < a < d | 4. | c < a < b < d |
An electric field exists in a certain region of space. Then the potential difference V = Vo– VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is:
| 1. | 10 V | 2. | –20 V |
| 3. | +20 V | 4. | –10 V |
A charge \(q_1=5 \times 10^{-8} \mathrm{~C}\) is kept at 3 cm from a charge \(q_2=-2 \times 10^{-8} \mathrm{~C}\). The potential energy of the system relative to the potential energy at infinite separation is:
1. 3 x J
2. –3 x J
3. 9 x J
4. –9 x J
A circuit has section AB as shown in figure. The emf of the cell is 10 V. The potential difference VAB= 5 V. The charge on the capacitor C1 is:
| 1. | 10 μC | 2. | 5 μC |
| 3. | 15 μC | 4. | Can't be determine |
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