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Along straight wire carries a current $I$. The magnetic field $B$ at a distance $r$ from the wire is proportional to:
- A.$r$
- B.$r^2$
- C.$\frac{1}{r}$
- D.$\frac{1}{r^2}$
Show correct answer & step-by-step solution
Correct answer: C — $\frac{1}{r}$
Solution
According to Ampere's Law, the magnetic field produced by an infinitely long straight wire is given by . Thus, the field is inversely proportional to the distance .
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