Question 1:
A positively charged particle is released from rest in an uniform electric field. The electric potential energy of the charge
ANS: decreases because the charge moves along the electric field.
Question 2:
Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately
ANS: spheres
Question 3:
Two small spheres each carrying a charge q are placed r metre apart. If one of the spheres is taken around the other one in a circular path of radius r, the work done will be equal to
ANS: zero
Question 4:
The electric potential V at any point O (x, y, z all in metres) in space is given by V = 4x² volt. The electric field at the point (1 m, 0, 2 m) in volt/metre is
ANS: 8 along negative x-axis
Question 5:
If a unit positive charge is taken from one point to another over an equipotential surface, then
ANS: no work is done
Question 6:
A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is
ANS: 10 V
Question 7:
The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is
ANS: independent of the distance between the plates.
Question 8:
A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system
ANS: decreases by a factor of 2.