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Q.The magnetic field at a distance 3 cm3\,\text{cm} from a long straight wire carrying 20 A20\,\text{A} current is

a
1.33×10−4 T1.33 \times 10^{-4}\,\text{T}
b
2.67×10−4 T2.67 \times 10^{-4}\,\text{T}
c
4×10−4 T4 \times 10^{-4}\,\text{T}
d
1.33×10−5 T1.33 \times 10^{-5}\,\text{T}

Correct Answer: Option A

The correct solution involves applying the fundamental concept to derive the final value step by step...

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