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31.The temperature of a wire of length 1 metre and area of cross-section is

31.The temperature of a wire of length 1 metre and area of cross-section is 1 cm2  is increased from 0°C to 100°C. If the rod is not allowed to increase in length, the force required will be  (α=10-5/°C and Y=1011 N/m2)

(a)   103 N                                           (b) 104 N

(c) 105 N                                             (d) 109 N

ANSWER-B

(3)

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