10.A brass rod of cross-sectional area
10. A brass rod of cross-sectional area 1cm2 and length 0.2 m is compressed lengthwise by a weight of 5 kg. If Young’s modulus of elasticity of brass is 1×1011 N/m2 and g=10 m/sec2 , then increase in the energy of the rod will be
(a) 10-5 J (b) 2.5×10-5 J
(c) 5×10-5 J (d) 2.5×10-4 J
Answer-b
(27)