Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions

Consider the following statements and select the correct statement(s).

1. Electric field lines are always perpendicular to equipotential surface.
2. No two equipotential surfaces can intersect each other.
3. Electric field lines are in the direction of tangent to an equipotential surface.

Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately.

The diagrams below show regions of equipotentials.

(i)	(ii)
(iii)	(iv)

A positive charge is moved from A to B in each diagram.

1. The potential at all the points on an equipotential surface is same.
2. Equipotential surfaces never intersect each other.
3. Work done in moving a charge from one point to other on an equipotential surface is zero.

A wire of length 50 cm moves with a velocity of 300 m/min, perpendicular to a magnetic field. If the e.m.f. induced in the wire is 2 V, the magnitude of the field in tesla is ______.

Equipotential surfaces ______.

Ampere’s circuital law is given by _______.

Two identical current carrying coaxial loops, carry current I in opposite sense. A simple amperian loop passes through both of them once. Calling the loop as C, then which statement is correct?

Which of the following is NOT the property of equipotential surface?

The emf induced across the ends of a conductor due to its motion in a magnetic field is called motional emf. It is produced due to magnetic Lorentz force acting on the free electrons of the conductor. For a circuit shown in the figure, if a conductor of length l moves with velocity v in a magnetic field B perpendicular to both its length and the direction of the magnetic field, then all the induced parameters are possible in the circuit.

Direction of current induced in a wire moving in a magnetic field is found using ______.

The emf induced across the ends of a conductor due to its motion in a magnetic field is called motional emf. It is produced due to magnetic Lorentz force acting on the free electrons of the conductor. For a circuit shown in the figure, if a conductor of length l moves with velocity v in a magnetic field B perpendicular to both its length and the direction of the magnetic field, then all the induced parameters are possible in the circuit.

A conducting rod of length l is moving in a transverse magnetic field of strength B with velocity v. The resistance of the rod is R. The current in the rod is ______.