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1. A hollow metal sphere of radius 20 cm is charged such that the potential on its surface is 120 Volt. The potential at the centre of the sphere is
A. 80 V
B. 6 V
C. 120 V
D. Zero
2. The work done in moving a positive test charge qo from infinity to a point P at a distance r from the charge q is
A. A
B. B
C. C
D. D
3. Electric field intensity is equal to
A. time rate of change of potential
B. minimum rate of change of potential with distance
C. maximum rate of change of potential with distance
D. none of the above
4. Electric potential at a point located far away from the charge is taken to be
A. Unity
B. May be zero or infinite
C. Zero
D. Infinite
6. A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. The potential at the centre of the sphere is
A. 0 V
B. 10 V
C. same as at point 25 cm away from the surface
D. same as at point 5 cm away from the surface
8. What is the direction of the lines of force at any point on the equipotential surface?
A. Parallel to it
B. Perpendicular to it.
C. Inclined at 45 degrees
D. None of the above
9. A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 80 volt. The potential at the centre of the sphere is
A. 8 volt
B. zero
C. 800 volt
D. 80 volt
11. E=-dV/dr, here the negative sign signifies that
A. E increases when V decreases
B. E is directed in the direction of decreasing V
C. E is negative
D. E is opposite to V
14. Whats motion?
A. Motion
B. Speed
C. Force
D. None
15. If 100 J of work has to be done in moving an electric charge of 4C from a place where potential is -5 V to another place, where potential is V volt. The value of V is
A. 15 V
B. 20 V
C. 25 V
D. 10 V
17. Electric potential is
A. scalar and dimensionless
B. vector and dimensionless
C. scalar with dimension
D. vector with dimension
18. The amount of work done in moving a unit positive charge through distance of 10 cm on an equipotential surface is
A. 100 joule
B. 10 cm
C. 1/10 cm
D. Zero
19. Equal charges are given to two spheres of different radii. The potential will
A. be equal on both the spheres
B. be more on the smaller sphere
C. be more on the bigger sphere
D. depend on the material of the sphere
20. A hollow metal sphere of radius 5cm is charged so that the potential on its surface is 10V. The potential at a distance of 2cm from the centre of the sphere is
A. 4V
B. zero
C. 10/3V
D. 10V
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