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Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is:
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Important Questions on Current Electricity
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Two metal wires of identical dimensions are connected in series. If and are the conductivities of the metal wires respectively, the effective conductivity if the combination is:
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In the given figure, a diode is connected to an external resistance and an of If the barrier potential developed across the diode is , the current in the circuit will be
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Two cities are apart. Electric power is sent from one city to another city through copper wires. The fall of potential per is volts and the average resistance per is The power loss in the wire is:
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The resistance in the two arms of the meter bridge are and respectively. When the resistance is shunted with an equal resistance, the new balance point is at The resistance ‘ ’ is:
