HARD
12th West Bengal Board
IMPORTANT
Earn 100

Two identical conducting balls and have positive charges and respectively but . The balls are brought together so that they touch each other and kept in thin original positions. The force between them is
(a)less than that before the balls touched
(b)greater than that before the balls touched
(c)same as that before the balls touched
(d)zero

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Important Questions on Interaction of Charged Particles, Electric Field and Potential
EASY
12th West Bengal Board
IMPORTANT
A conductor has given a charge by transferring electrons. Mass increase (in ) of the conductor and the number of electrons added to the conductor are respectively.

MEDIUM
12th West Bengal Board
IMPORTANT
A charge is placed at each of the opposite corners of a square. A charge is placed at each of the other two corners. If the net electrical force on is zero, then the equals

MEDIUM
12th West Bengal Board
IMPORTANT
Two equal charges are separated by a distance . third charge placed on a perpendicular bisector at distance from centre will experience maximum coulomb force, when

HARD
12th West Bengal Board
IMPORTANT
The bob of simple pendulum is hanging vertically down from a fixed identical bob by means of a string of length . If both bobs are charged with a charge each, time-period of the pendulum is (ignore the radii of the bobs)

HARD
12th West Bengal Board
IMPORTANT
A wooden block performs SHM on a frictionless surface with frequency The block carries a charge on its surface. If now a uniform electric field is switched on as shown in Fig. , then the SHM of the block will be

MEDIUM
12th West Bengal Board
IMPORTANT
A few electric field lines for a system of two charges and fixed at two different points on the X-axis are shown in the figure, Fig. These lines suggest that

EASY
12th West Bengal Board
IMPORTANT
Charges are placed on the vertices of a square as shown in Fig. . Let be the electric field and the potential at the centre. If the charges on and are interchanged with those on and respectively, then

MEDIUM
12th West Bengal Board
IMPORTANT
The potential at a point (measured in ) due to some charges situated on the -axis is given by
volt.
The electric field at is given by
