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Along straight wire carries a current $I = 10 \text{ A}$. A point $P$ is at a distance $r = 5 \text{ cm}$ from the wire. What is the magnitude of the magnetic field $B$ at point $P$?
- A.$4 \times 10^{-5} \text{ T}$
- B.$8 \times 10^{-5} \text{ T}$
- C.$2 \times 10^{-5} \text{ T}$
- D.$1 \times 10^{-5} \text{ T}$
Show correct answer & step-by-step solution
Correct answer: A — $4 \times 10^{-5} \text{ T}$
Solution
The magnetic field due to along straight wire is given by . Substituting the values, .
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