Electromagnetic Fields Objective Questions
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A conductor of length 100 cm moves at right angles to a magnetic field of flux density 1.5 Wb / m^{2} with a velocity of 50 m / s. The induced emf in the conductor will be
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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)
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A loop is rotating about xaxis in a magnetic field, B = BO cos(ω + φ) ay. The voltage in the loop is
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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
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Both the number of turns and the core length of an inductive coil are doubled. Its selfinductance will be
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A coil is wound on iron core which carries current I. The selfinduced voltage in the coil is not affected by
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The statement which is not correct from the following:
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In case of all flux from the current in coil 1 links with coil 2, the coefficient of coupling will be
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1 Maxwell is the same as
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A copper disc is rotated rapidly below a freely suspended magnetic needle. The magnetic needle starts rotating with velocity
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The property of the coil by which a counter emf is induced in it when the current through the coil changes is known as
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The magnitude of the induced emf in a conductor depends upon on the
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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?
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Mutually inductance between two magnetically coupled coils depends on
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Inside a hollow conducting sphere
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The emf induced in a conductor rotating in bipolar field is
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Electric field strength of charge
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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
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Two infinite parallel metal plates are charged with equal surface charge density of the same plates is.
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An insulated metal sphere of 20 cm diameter is charged by rubbing with charges 2 × 10^{8} C. Potential developed will be
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When a magnet is in motion relative to a coil the induced emf does not depend upon
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In above problem the induced emf will be reduced to half if the conductor moves an angle of
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Which of following circuit element stores energy in electro  magnetic field?
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A metal sphere with 1 m radius and a surface charge density of 10 coulombs / m^{2} is enclosed in a cube of 10 m side. The toatal outward electric displacement normal to the surface of the cube is.
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Self inductance of magnetic coil is proportional to
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What is the value of total electric flux coming out of a closed surface?
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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
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Which of following can induce the maximum induced voltage ?
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An emf of 16 volts is induced in a coil of inductance 4 H. The rate of change of current must be
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The direction of induced emf can be found by
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