In two co-axial same circular coils, same current is flowing in the same direction. If both the coils are brought towards each other, then what will be the change in the current?

Current will decrease in both the coils (by Lenz's law).

In two co-axial same circular coils, same current is flowing in t…

Two protons and two electrons are hanging freely at equal distances. Compare the repulsion force between proton and electron.

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What is the static-electric potential due to an electric dipole at an intermediate point?

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In Millikan's experiment, $-6.4 \times 10^{-19}$ Coulomb charge is found on a charged drop, then write the number of electrons in that charged drop.

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A 60 µF capacitor is connected to a 110V, 60 Hz ac supply. Determine the rms value of the current in the circuit.

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Define the term “threshold frequency”, in the context of photoelectric emission.

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Can a photon be deflected by an electric field? By a magnetic field?

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What is the relation between peak value and root mean square value of alternating voltage?

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What is the magnitude of electromotive forces of batteries used in any closed electric circuit?

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To measure the magnetic moment of a bar magnet, one may use:

A tangent galvanometer.
A deflection galvanometer if the earth's horizontal field is known.
An oscillation magnetometer if the earth's horizontal field is known.
Both deflection and oscillation magnetometer if the earth's horizontal field is not nown.

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In which directions do the electric and magnetic field vectors oscillate in an electromagnetic wave propagating along the x-axis?

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