A sphere of 4 cm radius is suspended within a hollow sphere of 6 cm radius. The inner sphere is charged to potential 3 e.s.u. and the outer sphere is earthed. The charge on the inner sphere is
1. 54 e.s.u.
2. e.s.u.
3. 30 e.s.u.
4. 36 e.s.u.
When one electron is taken towards the other electron, then the electric potential energy of the system -
1. Decreases
2. Increases
3. Remains unchanged
4. Becomes zero
Four charges are placed at the corners of a square taken in order. At the centre of the square
1.
2.
3.
4.
Point charge q1 = 2 μC and q2 = –1 μC are kept at points x = 0 and x = 6 respectively. Electrical potential will be zero at points
1. x = 2 and x = 9
2. x = 1 and x = 5
3. x = 4 and x = 12
4. x = –2 and x = 2
Equipotential surfaces associated with an electric field which is increasing in magnitude along the x-direction are
1. Planes parallel to yz-plane
2. Planes parallel to xy-plane
3. Planes parallel to xz-plane
4. Coaxial cylinders of increasing radii around the x-axis
A bullet of mass 2 gm is having a charge of 2 μC. Through what potential difference must it be accelerated, starting from rest, to acquire a speed of 10 m/s ?
1. 5 kV
2. 50 kV
3. 5 V
4. 50 V
Figure shows three points A, B and C in a region of uniform electric field . The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good. Where and VC represent the electric potential at points A, B and C respectively
1.
2.
3.
4.
In a certain charge distribution, all points having zero potential can be joined by a circle \(S.\) The points inside \(S\) have positive potential, and points outside \(S\) have a negative potential. A positive charge, which is free to move, is placed inside \(S.\) What is the correct statement about \(S\):
1. | It will remain in equilibrium |
2. | \(S,\) but it cannot cross \(S\) | It can move inside
3. | \(S\) at some time | It must cross
4. | It may move, but will ultimately return to its starting point |
A square of side ‘a’ has charge Q at its centre and charge ‘q’ at one of the corners. The work required to be done in moving the charge ‘q’ from the corner to the diagonally opposite corner is -
1. Zero
2.
3.
4.
As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge –Q from the point A [co-ordinates (0, a)] to another point B [co-ordinates (a, 0)] along the straight path AB is
1. Zero
2.
3.
4.