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in Physics by (25.0k points)
दिये गये भार को तार पर लगाने से उसमें वृद्धि 1.00 मिमी होती है | उसी धातु व उसी लम्बाई के तार, जिसकी त्रिज्या दोगुनी है, पर उसी बल को लगाने पर तार में वृद्धि होगी :
A. 5.00 मिमी
B. 0.25 मिमी
C. 4.00 मिमी
D. 2.00 मिमी |

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