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The magnetic field at a distance r from a long wire carrying current i is 0.4 tesla. The magnetic field at a distance 2r is
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- 0.2 tesla
- 0.8 tesla
- 0.1 tesla
- 1.6 tesla
Correct Option: A
| B = | or B ∝ | |||
| 2πr | r |
When r is doubled, the magnetic field becomes half, i.e., now the magnetic field will be 0.2 T.
