1.

Two material bars A and B of equal area of cross-section, are connected in series to a DCsupply. 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) Ifthe same constant current continues to flow for a long time, how will the voltagedrop across A and B be affected?Justify each answer.

Answer»

a) In bar B drift speed is higher.

Since, I=neAV

For semiconductor n is lower

b). With increase in resistance in A potential difference increases and in bar B with increase in resistance potential difference decreases.

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