Q. Two identical charged spheres suspended from a common point by two massless strings of lengths l are initially a distance d (d << l) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result, the charges approach each other with a velocity V. Then, as a function of distane x between them, :
Q. Two point charges + 8 q and -2 q are located at x=0 and x=L respectively. The location of a point on Z-axis at which the net electric field due to these two point charges is zero:
Q. A charged oil drop is suspended in uniform field of 3x104 Vm-1 so that it niether falls nor rises. The charge on the drop will be : (take the mass of the charge 9.9x10-15kg and g= 10 ms-2)
Q. An electric dipole is placed at an angle of 30° to a non-uniform electric field. The dipole will experience :
(a) a torque as wellas translational force.
(b) a torque only.
(c) a translational force only in the direction of the field.
(d) a translational force only in a direction normal to the direction of the field.
Q. On moving a charge of 20 C by 2 cm, 2 J of work is done. Then, the potential difference between the points is :
(a) 0.1 V
(b) 8 V