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:  Capacitance |
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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:  Equipotential Surfaces |
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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 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:  Energy stored in Capacitor |
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An electric dipole is place at an angle of 30 with an electric field intensity 2×105 N/C. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is

(a) 8 mC              (b) 2 mC

(c) 5 mC              (d) 7 μ

Subtopic:  Energy of Dipole in an External Field |
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A parallel-plate capacitor of area A, plate separation d, and capacitance C is filled with four dielectric materials having dielectric constants k1,k2,k3 and k4 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) k=k1+k2+k3+3k4

(b) k=23k1+k2+k3+2k4

(c) 1k=32k1+k2+k3+12k4

(d) 1k=1k1+1k2+1k3+32k4

Subtopic:  Dielectrics in Capacitors |
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A capacitor of 2 μF 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:  Energy stored in Capacitor |
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A capacitor of 2 µF 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:  Energy stored in Capacitor |
To view explanation, please take trial in the course below.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology