Electromagnetic Fields Objective Questions
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Electric field intensity (E) at any point in an electric field is equal to
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The change of cross sectional area of conductor in magnetic field will affect
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Two straight parallel conductors carry equal currents in opposite direction. The force between them is
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Electric flux in coulombs emanating from any surface of a cube containing C coulombs of charge at its centre
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Inside a hollow conducting sphere
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The force between two long parallel conductors is inversely proportional to
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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 exists between the conductor and the ground. The maximum electric stress occurs at
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Conductor is constant and field is varying then emf will induce. This principle is called
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According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is
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Ohm’s law in point from field theory can be expressed as
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The right hand rule for determining the direction of the induced EMF was introduced by
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A metal surface with 1 meter radius and surface charge density of 20 coulombs / m2 is enclosed in a 10 m side. The total outward electric displacement normal to the surface of the cube is
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Biot-Savarts law states the relation between magnetic intensity and
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It was suggested by _____________ that the electric field should be imagined to be divided into tubes of force containing a fixed number of line of force
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The field at any point on the axis of a current carrying coil will be
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Midway between two equal and similar charges, a third equal and similar charge is placed, then this third charged will
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The energy stored in the magnetic field at a solenoid 30 cm long & 3 cm diameter wound with 1000 turns of wire carrying a current at 10 amp, is
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Inside a hollow conducting sphere
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A wire carrying current is bent in the form of a circular loop. Then the magnetic field around each portion of the wire will be
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As a result of reflection from a plane conducting wall, electromagnetic waves acquire an apparent velocity greater than the velocity of light in space. This is called the
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Two parallel plates are separated by a distance D charged by V volt. The field intensity E is given by,
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Which of the following represents ohms law
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A point pole has a strength of 4π × 10-7 weber. The force in newtons on a point pole of 4π × 1.5 × 10-4 weber placed at a distance of 10 cm from it will be
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In the left hand rule, forefinger always represents
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Cork Screw rule is used to find
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A conductor of length L has carrying current I passing through it, when it is placed parallel to strong magnetic field. The force experienced by the conductor will be
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Whenever the magnetic flux changes with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s
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Two infinite parallel metal plates are charged with equal surface charge density of the same polarity. The electric field in the gap between the plates is
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Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be
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The drawback of Daltons atomic structure is that, it says
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