A. 4800J
B. 1200J
C. 480J 7°
D. 202J
E. 80J

Correct Answer:

Option C = 480J

Explanation

H= mCθ
= 200 x 0.4 x 6

= 480J

SEE ALSO  A copper wire was subjected to a tensile stress of 7.7 x 10^7 x 10 Nm−². Calculate strain of the wire. [young modules = 1.1 x 10¹¹ Nm−²]

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