Single correct · +4 / −1
The magnetic field at distance r from a long straight wire carrying current I is:
- (a) μ₀ I/(2π r)
- (b) μ₀ I/(4π r)
- (c) μ₀ I r
- (d) μ₀ I/r
Answer and solution
Answer (a) μ₀ I/(2π r)
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