BITSAT 2017 Paper

When the wire is bent in the form of a square and M and N as shown in fig (2) ,effective resistance M and N decrease to one fourth of the value in fig (1).The current increases four times the initial value according to the relation V=IR ,Since H=I2Rt,the decrease in the value of resistance is more than compensated by the increases Percentage loss in energy during the collision≃56%