Select True or False. Current density J is a scalar. A 6 length of copper wire h

Question

Select True or False. Current density J is a scalar. A 6 length of copper wire has a resistivity of 1.7. The wire is cut in half. The resistivity of the wire is doubled. The mean free time between collisions in a current carrying conductor is independent of the applied voltage. Semi-conductors generally have a negative temperature coefficient of resistivity. The drift velocity of electrons in a typical conductor for currents of the order of 1 A is a few mm/s. The graph represents the Voltage-Current characteristic for an unknown resistor. Determine the value of the resistor from the graph.

Explanation / Answer

for the true and false

Current density as a scalar -- TRUE

False - as the resistivity will be same for any shape and size of wire

False -- this is not independent of voltage as current will increase with voltage

True -- resitance of semiconductor will increase with time

False - it is usually some um per s

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