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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A square of side ‘a’ has charge Q at its centre and charge ‘q’ at one of the corners. The work required to be done in moving the charge ‘q’ from the corner to the diagonally opposite corner is -

(1) Zero

(2) Qq4π0a

(3) Qq24π0a

(4) Qq2π0a

Subtopic:  Electric Potential |
 72%
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As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge –Q from the point A [co-ordinates (0, a)] to another point B [co-ordinates (a, 0)] along the straight path AB is

(1) Zero

(2) qQ4πε01a22a

(3) qQ4πε01a2a2

(4) qQ4πε01a22a

Subtopic:  Electric Potential |
 79%
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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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Two thin wire rings each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are +q and –q. The potential difference between the centres of the two rings is -

(1) Zero

(2) Q4πε01R1R2+d2

(3) QR/4πε0d2

(4) Q2πε01R1R2+d2

Subtopic:  Electric Potential |
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A hollow metallic sphere of radius R is given a charge Q. Then the potential at the centre is -

(1) Zero

(2) 14πε0.QR

(3) 14πε0.2QR

(4) 14πε0.Q2R 

Subtopic:  Electric Potential |
 78%
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A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in -

(1) Reduction of charge on the plates and increase of potential difference across the plates

(2) Increase in the potential difference across the plate, reduction in stored energy, but no change in the charge on the plates

(3) Decrease in the potential difference across the plates, reduction in the stored energy, but no change in the charge on the plates

(4) None of the above

Subtopic:  Dielectrics in Capacitors |
 78%
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The capacity of a condenser is 4 × 10–6 farad and its potential is 100 volts. The energy released on discharging it fully will be -

(1) 0.02 Joule

(2) 0.04 Joule

(3) 0.025 Joule

(4) 0.05 Joule

Subtopic:  Energy stored in Capacitor |
 83%
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The insulated spheres of radii R1 and R2 having charges Q1 and Q2 respectively are connected to each other. There is -

(1) No change in the energy of the system

(2) An increase in the energy of the system

(3) Always a decrease in the energy of the system

(4) A decrease in the energy of the system unless Q1R2 = Q2R1

Subtopic:  Electric Potential |
 55%
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The energy stored in a condenser of capacity C which has been raised to a potential V is given by -

(1) 12CV

(2) 12CV2

(3) CV

(4) 12VC

Subtopic:  Energy stored in Capacitor |
 94%
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