1. The single phase, 50 Hz iron core transformer in the circuit has both the vertical arms of cross sectional area 20 cm2 and both the horizontal arms of cross sectional area 10 cm2. If the two windings shown were wound instead on opposite horizontal arms, the mutual inductance will
(A) double (B) remain same
(C) be halved (D) become one quarter
SOl: Given single-phase iron core transformer has both the vertical arms of cross section area 20 cm2, and both the horizontal arms of cross section are 10 cm2
So, Inductance NBA/ 1 (proportional to cross section area) When cross section became half, inductance became half.
Hence (C) is correct option.