# 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 ${10}^{-4}$ J 2. –3 x ${10}^{-4}$ J 3. 9 x ${10}^{-6}$ J 4. –9 x ${10}^{-6}$ J

Subtopic:  Electric Potential Energy |
73%
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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 $$1.5 \times 10^{-6}~ \mathrm N$$
Subtopic:  Capacitance |
70%
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Two condensers of capacity 0.3 $\mu F$ and 0.6 $\mu F$ 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. $\frac{1}{2}$

2. 2

3. $\frac{1}{4}$

4. 4

Subtopic:  Energy stored in Capacitor |
66%
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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.

Subtopic:  Capacitance |
66%
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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
Subtopic:  Combination of Capacitors |
55%
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The electric potential in a certain region of space is given by V = –8x2 + 4x, where V is in volt and x is in metre. In this region, the equipotential surface is:

 1 plane parallel to yz plane 2 plane parallel to the x-axis 3 concentric circle centered at the origin 4 coaxial cylinder with axis parallel to the y-axis

Subtopic:  Equipotential Surfaces |
63%
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Some equipotential surfaces are shown in figure. The electric field at points A, B and C are respectively:

 1 $$1 \mathrm{~V} / \mathrm{cm}, \frac{1}{2} \mathrm{~V} / \mathrm{cm}, 2 \mathrm{~V} / \mathrm{cm} \text { (all along +ve X-axis) }$$ 2 $$1 \mathrm{~V} / \mathrm{cm}, \frac{1}{2} \mathrm{~V} / \mathrm{cm}, 2 \mathrm{~V} / \mathrm{cm} \text { (all along -ve X-axis) }$$ 3 $$\frac{1}{2} \mathrm{~V} / \mathrm{cm}, 1 \mathrm{~V} / \mathrm{cm}, 2 \mathrm{~V} / \mathrm{cm} \text { (all along +ve X-axis) }$$ 4 $$\frac{1}{2} \mathrm{~V} / \mathrm{cm}, 1 \mathrm{~V} / \mathrm{cm}, 2 \mathrm{~V} / \mathrm{cm} \text { (all along -ve X-axis) }$$

Subtopic:  Equipotential Surfaces |
69%
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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

Subtopic:  Relation between Field & Potential |
75%
From NCERT
NEET - 2020
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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. $$50~\text{V}$$

Subtopic:  Energy of Dipole in an External Field |
66%
From NCERT
NEET - 2020
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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 $$0.44 \times 10^{-13} ~\text{C}^2 \text{N}^{-1} \text{m}^{-2}$$

Subtopic:  Dielectrics in Capacitors |
61%
From NCERT
NEET - 2020
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