An energy source will supply a constant current into the load if its internal resistance is

equal to the resistance of the load

very large as compared to the load resistance

non-zero but less that the resistance of the load

When current is passed through a wire heat is produced due to

collision of conduction electron with atoms.

fall of electron from higher energy orbits to lower energy orbits

If a good conductor is connected between a point of an electric circuit and the ground.

current flow from the point to the earth

the potential of the point is the same as that of the earth.

current flows through the conductor only if one more point of the same circuit with some resistance between the two is connected to the ground

when the current flows through the conductor to the earth the current through the circuit remains unchangaed

A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are

current, electric field and drift speed

The electric resistance of a certain wire of iron is R . If its length and radius are both doubled then

the resistance will be halved and the specific resistance will be doubled

the resistance will be doubled and the specific resistance will be halved

the resistance and the specific resistance will both remain unchanged

the resistance will be halved and the specific resistance will remain unchanged

We are able to obtain fairly large current in a conductor because.

the electron drift speed is usually very large

the very small magnitude of the electron charge has to be divided by the still smaller product of the number density and drift speed to get the electric current

the number density of free electron as well as the electron drift speed are very large and these compensate for the very small magnitude of the electron charge

the number density of free electron is very high and this can compensate for the low values of the electron drift speed and the very small magnitude of the electron charge

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