The electric cell does 5 Joule of work in carrying 10 C of charge around a close electric circuit. The electromotive force of the cell is :
An energy source will supply a constant current into the load if its internal resistance is
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When current is passed through a wire heat is produced due to
If a good conductor is connected between a point of an electric circuit and the ground.
When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be :
A heater coil is cut into two equals parts and only one part is now used in the heater. The heat generated will now be :
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
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled then
We are able to obtain fairly large current in a conductor because.
N identical cells each of emf E and internal resistance r, are joined in series to from a closed circuit. One cell A is joined with reverse polarity. The potential difference across each cell except A is