a steady current flows in a conductor of uniform cross section taught in any part of the conductor
Answers
Answer:
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Explanation:
[a] When a steady current flows in a metallic conductor of non uniform cross-section, the current flowing through the conductor is constant. Current density, electric field, and drift speed are inversely proportional to the area of cross-section. Therefore, they are not constant.
[b]No, Ohm’s law is not universally applicable for all conducting elements. Vacuum diode semi-conductor is a non-ohmic conductor. Ohm’s law is not valid for it.
[c] According to Ohm’s law, the relation for the potential is V=IR
Voltage (V) is directly proportional to current (I).
R is the internal resistance of the source,

If V is low, then R must be very low, so that high current can be drawn from the source.
[d] In order to prohibit the current from exceeding the safety limit, a high tension supply must have a very large internal resistance. If the internal resistance is not large, then the current drawn can exceed the safety limits in case of a short circuit.