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A steady current I is flowing in the – x direction through each of two infinitely long wires at
y = ± L 2
The permeability of the medium is μ0. The →B – field at (0, L, 0) is
-
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- 4μ0I ẑ 3πL -
+ 4μ0I ẑ 3πL
- 0
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- 3μ0I ẑ 4πL
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Correct Option: A
H = H1 + H2
| = | (-az) + | (-az) | |||||||
| 2π(L / 2) | 2π |  |  | ||||||
| 2 | |||||||||
| = | (-az) |  | + |  | ||||
| 2π | L | 3L |
| = | (-az) | |
| 3πL |
