Question

There are two batteries A and B having same emf. A has no internal resistance and B has some internal resistance. An inductance is connected first to A and the energy in the uniform magnetic field setup inside is $U$. It is now disconnected from A and reconnected to B. The energy stored in the uniform magnetic field will be

• A. $U$
• B. $>U$
• C. $<U$
• D. $0$

Answer 1

Answer: (C)

$<U$

In battery B, there is some internal resistance so, same energy is consumed by that resistance, so, energy stored in uniform magnetic field will be less that the energy stored while inductance is connected to A.