A charge of 10 e.s.u. is placed at a distance of 2 cm from a charge of 40 e.s.u. and 4 cm from another charge of 20 e.s.u. The potential energy of the charge 10 e.s.u. is: (in ergs

1. 87.5 2. 112.5
3. 150 4. 250

Subtopic:  Electric Potential Energy |
 58%
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In a certain charge distribution, all points having zero potential can be joined by a circle S. Points inside S have positive potential, and points outside S have a negative potential. A positive charge, which is free to move, is placed inside SWhat is the correct statement about S:

1. It will remain in  equilibrium 2. It can move inside S, but it cannot cross S
3. It must cross S at some time 4. It may move, but will ultimately return to its starting point
Subtopic:  Equipotential Surfaces |
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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%
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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%
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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%
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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%
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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%
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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%
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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 |
 89%
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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