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The magnetic induction at a point P which is at a distance of 4 cm from a long current carrying wire is 10-3 T. The field of induction at a distance 12 cm from the current will be
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- 3.33 × 10-4 T
- 1.11 × 10-4 T
- 3 × 10-3T
- 9 × 10-3 T
Correct Option: A
| B = | ⇒ B ∝ | |||
| 2πr | r |
As the distance is increased to three times, the magnetic induction reduces to one third. Hence,
| B = | × 10-3 tesla = 3.33 × 10-4 tesla | |
| 3 |
