TEST CHAPTER-1 , 2
SET-1 Electric charges and field
- Two small identical sphere having charges +10μC attract each other with a force of F newton. If they are kept in contact and then separated by the same distance, the new force between them is: (a)F/6 (b) 16F (c) 16F/9 (d) 9F
- A charge q is placed at the mid-point of the line joining two equal charges Q. The system of three charges will be in equilibrium when q has the value: (a)Q/4 (b) Q/2 (c) -Q/4 (d) -Q/2
- An electric dipole is placed in a non-uniform electric field. Then net:(a)force experienced is zero while torque is not zero(b)force experienced is zero and torque is also zero(c)both force and torque are not zero(d)force experienced is not zero while torque is zero
- The total electric flux leaving spherical surface of radius 1cm and surrounding an electric dipole is: (a)q/ε0 (b) zero (c) 2q/ε0 (d) 8πr2q/ε0
- Two particles of masses m and 2m with charge 2q and 2q are placed in a uniform electric field E and allowed to move for the same time. The ratio of their kinetic energies will be:(a)2 : 1 (b) 8 : 1 (c) 4 : 1 (d) 1 : 4
- Electric charges q , q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of electric dipole moment of the system is: (a)ql (b) 2ql (c) √3ql (d) 4ql
- A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The KE attained by the particle after moving a distance y is: (a)qEy2 (b) qE2y (c) qEy (d) q2Ey
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