A closely wound coil has ten turns. The magnetic flux through its 5th turn is \( \Phi_B \). The magnetic flux through its 3rd turn is
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → \( \Phi_B \)
The turns of a closely wound coil lie side by side and enclose the same area. So the same magnetic flux is linked with every turn. The flux does not depend on where a turn lies in the coil. The 3rd turn has the same flux \( \Phi_B \) as the 5th, and the flux linkage of the whole coil is \( 10\,\Phi_B \).
NCERT (2026-27):
Inductance – “For a closely wound coil of N turns, the same magnetic flux is linked with all the turns. When the flux ΦB through the coil changes, each turn contributes to the induced emf.”