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Two material bars A and B of equal area of cross-section, are connected in series to a DC supply. A is made of usual resistance wire and B of an n-type semiconductor.(a) In which bar is drift speed of free electrons greater?(b) If the same constant current continues to flow for a long time, how will the voltage drop across A and B be affected? Justify each answer. |
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Answer» (a) Drift speed in B (n-type semiconductor) is higher Reason: I = neAvd is same for both n is much lower in semiconductors. (b) Voltage drop across A will increase as the resistance of A increases with increase in temperature. Voltage drop across B will decrease as resistance of B will decrease with increase in temperature. |
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