current-electricity Question 10
Question: Q. 11. Write the expression for the drift velocity of charge carriers in a conductor of length
R [O.D. Comptt. I, II, III 2014]
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Solution:
Ans.
[CBSE Marking Scheme 2014]
Detailed Answer :
Since drift velocity,
But,
Now, from equation (i)and (ii),
Drift velocity,
[AT Q. 12. How does one explain increase in resistivity of a metal with increase in temperature?
U [O.D. Comptt. I, II, III 2014]
Ans. With increase in temperature, the relaxation time (average time between successive collisions) decreases and hence resistivity increases.
Alternatively,
Resistivity,
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