The negative electric flux indicates that the net flux through the surface is
inward
outward
outward or inward
none of the above
The potential of a point A is -500 V and that of another point B is +500 V. The work done by an external agent to take 2 units of negative charge from B to A is
+1000 J
-1000 J
+2000 J
-2000 J
The electric potential V at any point (x1, y1, z1) in space is given by V = 4x2 volt. The electric field at (1, 0, 2) m in Vm-1 is
8, along negative x-axis
8, along positive x-axis
16, along negative x-axis
16, along positive y-axis
The formation of a dipole is due to two equal and dissimilar point charges placed at a
short distance
long distance
above each other
A point charge + q is placed at midpoint of a cube of side L. The electric flux emerging from the cube is
zero
On moving a charge of 20 coulomb by 2 cm, 2 J of work is done, then the potential difference between the points is
0.1 V
8 V
2 V
0.5 V
A point Q lies on the perpendicular bisector of an electric dipole of dipole moment p. If the distance of Q from the dipole is r, (much larger than the size of the dipole) then electric field at Q is proportional to
p-1 and r2
p and r-2
p2 and r-3
p and r-3
The dielectric strength of air at NTP is 3 x 106 V/m. The maximum charge that can be given to a spherical conductor of radius 3 m is
3 x 104 C
3 x 10-3 C
3 x 10-2 C
3 x 10-1 C
Some charge is being given to a conductor, then its potential is
maximum at surface
maximum at centre
same throughout the conductor
maximum somewhere between surface and centre
Two spherical conductors A and B of radii 1 mm and 2 mm are separated by a distance of 5 cm and are uniformly charged. If the spheres are connected by a conducting wire then in equilibrium condition, the ratio of the magnitude of the electric fields at the surfaces of spheres A and B is
4 : 1
1 : 2
2 : 1
1 : 4