Electromagnetic Fields Objective Questions – Set 3

An insulated metal sphere of 20 cm diameter is charged by rubbing with charges 2 × 10^-8 C. Potential developed will be

The magnitude of the induced emf in a conductor depends upon on the

Which of following circuit element stores energy in electro - magnetic field?

A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exits between the conductor and the ground. The maximum electric stress occur at

Mutually inductance between two magnetically coupled coils depends on

A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by

Two point charges are in the vertex of the square. If potential is another vertex is 2 V, so potential in opposite vertex (diagonally) is

Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be

1 Maxwell is the same as

What is the value of total electric flux coming out of a closed surface?

The emf induced in a conductor rotating in bipolar field is

Self inductance of magnetic coil is proportional to

An electric field on a place described by its potential V = 20 (r^-1 + r^-2 ) where r is the distance from the source. The field is due to

A copper disc is rotated rapidly below a freely suspended magnetic needle. The magnetic needle starts rotating with velocity

Two infinite parallel metal plates are charged with equal surface charge density of the same plates is.

The statement which is not correct from the following:

A conductor of length 100 cm moves at right angles to a magnetic field of flux density 1.5 Wb / m² with a velocity of 50 m / s. The induced emf in the conductor will be

An electric dipole of moment P is placed in front of a ground sphere. The change induced on the surface of the sphere is (Assume radius of sphere = R and distance from dipole to centre of sphere = d)

Electric field strength of charge

When a magnet is in motion relative to a coil the induced emf does not depend upon

In case of all flux from the current in coil 1 links with coil 2, the coefficient of coupling will be

A metal sphere with 1 m radius and a surface charge density of 10 coulombs / m² is enclosed in a cube of 10 m side. The toatal outward electric displacement normal to the surface of the cube is.

Inside a hollow conducting sphere

Which of following can induce the maximum induced voltage ?

In above problem the induced emf will be reduced to half if the conductor moves an angle of

Two identical circular coils, one closed and another is little split (not enclosed) are placed in an uniform magnetic field which decrease at a constant rate. If the plane to the coils are perpendicular to the field which of the following statements is true?

A loop is rotating about x-axis in a magnetic field, B = BO cos(ω + φ) ay. The voltage in the loop is

The direction of induced emf can be found by

An emf of 16 volts is induced in a coil of inductance 4 H. The rate of change of current must be

The property of the coil by which a counter emf is induced in it when the current through the coil changes is known as