Question

A conducting rod of mass $m$ and length $l$ is free to move without friction on two parallel long conducting rails, as shown below. There is a resistance $R$ across the rails. In the entire space around, there is a uniform magnetic field $B$ normal to the plane of the rod and rails. The rod is given an impulsive velocity ${\upsilon }_0$

Finally, the initial energy $\frac{1}{2}m{\upsilon }_0^2$

• A. will be converted fully into heat energy in the resistor
• B. will enable rod to continue to move with velocity v0, since the rails are frictionless
• C. will be converted fully into magnetic energy due to induced current
• D. will be converted into the work done against the magnetic field

Answer 1

Answer: (A)

Due to motion of conductor in region of magnetic field, anemf is generated in the conducting loop.
Induced current produces heat when it flows through resistor