Question

If the extension in both the springs increases from x to x₀ on flowing current I in the rod from B to A then, the value of magnetic field will be-

• A.
• B.
• C.
• D.

Answer 1

Answer: (D)

Answer 2

mg = 2kx ....(i)

mg + IBl = 2kx₀ ...... (2)

$\frac { \mathrm { mg } + \mathrm { IB } \ell } { \mathrm { mg } }$ = or

IBl = mg(– 1) or B =