Answer the following questions: (a) A steady current flows in a metallic conductor of non-uniform cross- section. Which of these quantīties is constant along the conductor: current, current density, electric field, drift speed? (b) Is Ohm's law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm's law. (c) A low voltage supply from which one needs high currents must have very low internal resistance. Why?
Answer the following questions: (a) A steady current flows in a metallic conductor of non-uniform cross- section. Which of these quantīties is constant along the conductor: current, current density, electric field, drift speed? (b) Is Ohm's law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm's law. (c) A low voltage supply from which one needs high currents must have very low internal resistance. Why?
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Transcribed Image Text:Answer the following questions:
(a) A steady current flows in a metallic conductor of non-uniform cross- section. Which
of these quantities is constant along the conductor: current, current density, electric
field, drift speed?
(b) Is Ohm's law universally applicable for all conducting elements?
If not, give examples of elements which do not obey Ohm's law.
(c) A low voltage supply from which one needs high currents must have very low
internal resistance. Why?
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