The electrostatic force between the metal plates of an isolated parallel plate capacitor $$C$$ having a charge $$Q$$ and area $$A$$ is:

 1 independent of the distance between the plates 2 linearly proportional to the distance between the plates 3 proportional to the square root of the distance between the plates 4 inversely proportional to the distance between the plates
Subtopic: Â Capacitance |
Â 60%
From NCERT
NEET - 2018
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NEET 2023 - Target Batch - Aryan Raj Singh

The diagrams below show regions of equipotentials.

A positive charge is moved from A to B in each diagram. Then:

 1 the maximum work is required to move q in figure(iii). 2 in all four cases, the work done is the same. 3 the minimum work is required to move q in the figure(i). 4 the maximum work is required to move q in figure(ii).
Subtopic: Â Equipotential Surfaces |
Â 89%
From NCERT
NEET - 2017
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of the resulting system:

 1 decreases by a factor of $$2$$ 2 remains the same 3 increases by a factor of $$2$$ 4 increases by a factor of $$4$$
Subtopic: Â Energy stored in Capacitor |
Â 57%
From NCERT
NEET - 2017
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

An electric dipole is place at an angle of $$30^{\circ}$$ with an electric field intensity $$2\times10^{5}~\text{N/C}$$. It experiences a torque equal to $$4~\text{Nm}$$. 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 $$7~\mu\text{C}$$

Subtopic: Â Energy of Dipole in an External Field |
Â 86%
From NCERT
NEET - 2016
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

A parallel-plate capacitor of area A, plate separation d, and capacitance C is filled with four dielectric materials having dielectric constants ${k}_{1},{k}_{2},{k}_{3}$ and ${k}_{4}$ as shown in the figure below. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant k is given by

(a) $\mathrm{k}={\mathrm{k}}_{1}+{\mathrm{k}}_{2}+{\mathrm{k}}_{3}+3{\mathrm{k}}_{4}$

(b) $k=\frac{2}{3}\left({k}_{1}+{k}_{2}+{k}_{3}\right)+2{k}_{4}$

(c) $\frac{1}{k}=\frac{3}{2\left({k}_{1}+{k}_{2}+{k}_{3}\right)}+\frac{1}{2{k}_{4}}$

(d) $\frac{1}{\mathrm{k}}=\frac{1}{{\mathrm{k}}_{1}}+\frac{1}{{\mathrm{k}}_{2}}+\frac{1}{{\mathrm{k}}_{3}}+\frac{3}{2{\mathrm{k}}_{4}}$

Subtopic: Â Dielectrics in Capacitors |
Â 68%
From NCERT
NEET - 2016
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

A capacitor of $$2~\mu\text{F}$$ is charged as shown in the figure. When the switch $${S}$$ is turned to position $$2,$$, the percentage of its stored energy dissipated is:

1. $$20\%$$
2. $$75\%$$
3. $$80\%$$
4. $$0\%$$
Subtopic: Â Energy stored in Capacitor |
Â 72%
From NCERT
NEET - 2016
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
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