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)

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Electromagnetic Field Theory

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)

PR/d2.

PR/d.

Zero.

PR 2/d3.

PR/d2.

PR/d.

Zero.

PR 2/d3.

MUF is highest in periods of greatest sunspot activity.

False

True

False

True

Electromagnetic Field Theory

A plane wave in a homogeneous medium has E = 50 sin(108t + 2z) uy V/m. What is the direction of wave propagation

y direction.

– y direction.

z direction.

– z direction.

y direction.

– y direction.

z direction.

– z direction.

Electromagnetic Field Theory

In an iron core coil the iron core is removed so that the coil becomes an air core coil. The inductance of the coil will

increase.

remain the same.

initially increase and then decrease.

decrease.

increase.

remain the same.

initially increase and then decrease.

decrease.

Electromagnetic Field Theory

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?

Joule heating does not occur in each of the coils.

An emf is induced in both coils.

Equal joule heating occurs in both coils.

An emf is induced in split coil.

Joule heating does not occur in each of the coils.

An emf is induced in both coils.

Equal joule heating occurs in both coils.

An emf is induced in split coil.

Electromagnetic Field Theory

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

150 V.

50 V.

75 V.

37.5 V.

150 V.

50 V.

75 V.

37.5 V.

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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)

MUF is highest in periods of greatest sunspot activity.

A plane wave in a homogeneous medium has E = 50 sin(108t + 2z) uy V/m. What is the direction of wave propagation

In an iron core coil the iron core is removed so that the coil becomes an air core coil. The inductance of the coil will

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 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

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