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At what distance from a long straight wire carrying a current of 12 A will the magnetic field be equal to 3 × 10-5 Wb/m² ?
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- 8 × 10-2m
- 12 × 10-2m
- 18 × 10-2m
- 24 × 10-2m
Correct Option: A
Current (I) = 12 A and magnetic field (B) = 3 × 10–5 Wb/m². Consider magnetic field →B at distance r.
| Magnetic field , B = | |
| 2πr |
| ⇒ r = | = | = 8 × 10-2m | ||
| 2πB | 2 × π × (3 × 10-5) |
