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Two coil 'P' and 'Q' are separated by some distance. When a current of 3 A flows through coil 'P' a magnetic flux of 10⁻³ Wb passes through 'Q'. No current is passed through 'Q'. When no current passes through 'P' and a current of 2 A passes through 'Q', the flux through 'P' is:
- 6.67 × 10⁻³ Wb
- 3.67 × 10⁻⁴ Wb
- 6.67 × 10⁻⁴ Wb
- 3.67 × 10⁻³ Wb
Correct answer: 6.67 × 10⁻⁴ Wb
Solution
The magnetic flux through coil 'P' when 2 A flows through coil 'Q' can be determined using the principle of mutual inductance. Since the flux through 'Q' due to 'P' is proportional to the current in 'P', we can use the ratio of the currents (2 A in 'Q' to 3 A in 'P') to find the new flux, resulting in 6.67 × 10⁻⁴ Wb.
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