Question

Two coils A and B are separated by a certain distance. If a current of 4 A flows through A, a magnetic flux of 10-3 Wb passes through B (no current through B). If no current passes through A and a current of 2 A passes through B, then the flux through A is

• A. 5 x 10-3 Wb
• B. 4x 10-4 Wb
• C. 5 x 10-4 Wb
• D. 2 x 10-3 Wb

Answer 1

Answer: (C)

5 x 10-4 Wb

Answer 2

Magnetic flux linked with coil

$\phi _ { \mathrm { B } } = \mathrm { MI } _ { \mathrm { A } }$

$\therefore \mathrm { M } = \frac { \phi _ { \mathrm { B } } } { \mathrm { I } _ { \mathrm { A } } } = \frac { 10 ^ { - 3 } } { 4 }$ henry

Magnetic flux linked with coil A