Year: 2019
Topic: Thermal properties of matter
Time :
1.
When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + l ). The elastic potential energy stored in the extended wire is
(1). \(\displaystyle \frac{1}{2}\) MgL
(2). \(\displaystyle Mgl\)
(3). \(\displaystyle MgL\)
(4). \(\displaystyle \frac{1}{2}\,Mgl\)