Two charges q1 and q2 are placed 30 cm apart, as shown in the figure. A third charge q3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is q34πε0k, where k is:

     

1. 8q2 2. 8q1
3 6q2 4. 6q1

Subtopic:  Electric Potential Energy |
 66%
From NCERT
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If the dielectric constant and dielectric strength be denoted by k and x respectively, then a material suitable for use as a dielectric in a capacitor must have:

1. high k and high x.

2. high k and low x.

3. low k and low x.

4. low k and high x.

Subtopic:  Dielectrics in Capacitors |
 56%
From NCERT
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Three capacitors of capacitances 3 μF, 9 μF and 18 μF are connected once in series and another time in parallel. The ratio of equivalent capacitance in the two cases CsCp will be:

1. 1 : 15

2. 15 : 1

3. 1 : 1

4. 1 : 3

Subtopic:  Combination of Capacitors |
 87%
From NCERT
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Four capacitors each of capacity 3 μF are connected as shown in the adjoining figure. The ratio of equivalent capacitance between A and B and between A and C will be:

      

1. 4: 3

2. 3: 4

3. 2: 3

4. 3: 2

Subtopic:  Combination of Capacitors |
 69%
From NCERT
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A parallel plate condenser is filled with two dielectrics as shown. Area of each plate is A metre2 and the separation is t metre. The dielectric constants are k1 and k2 respectively. Its capacitance in farad will be:

      

1. ε0At(k1+k2)

2. ε0At.k1+k22

3. 2ε0At(k1+k2)

4. ε0At.k1k22

Subtopic:  Dielectrics in Capacitors |
 61%
From NCERT
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In the connections shown in the adjoining figure, the equivalent capacity between A and B will be:

     

1. 10.8 μF

2. 69 μF

3. 15 μF

4. 10 μF

Subtopic:  Combination of Capacitors |
 72%
From NCERT
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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 |
 90%
From NCERT
NEET - 2017
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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 |
 63%
From NCERT
NEET - 2016
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A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielectric slab of dielectric constant K, which can just fill the air gap of the capacitor, is now inserted in it. Which of the following is incorrect?
 

1. The potential difference between the plates decreases K times
2. The energy stored in the capacitor decreases K times
3. The change in energy stored is \({1 \over 2} CV^{2}(\frac{1}{K}-1)\)
4. The charge on the capacitor is not conserved

Subtopic:  Energy stored in Capacitor |
 70%
From NCERT
NEET - 2015
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\(\mathrm{A}\), \(\mathrm{B}\) and \(\mathrm{C}\) are three points in a uniform electric field. The electric potential is:

1. maximum at \(\mathrm{A}\)
2. maximum at \(\mathrm{B}\)
3. maximum at \(\mathrm{C}\)
4. same at all the three points \(\mathrm{A},\mathrm{B} ~\text{and}~\mathrm{C}\)
Subtopic:  Relation between Field & Potential |
 82%
From NCERT
NEET - 2013
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