AP EAMCET · PHYSICS · Magnetic Effects of Current
The maximum magnetic field produced by a current of 12 A passing through a copper wire of diameter 1.2 mm is
- A 2 mT
- B 4 mT
- C 1.5 mT
- D 8 mT
Answer & Solution
Correct Answer
(B) 4 mT
Step-by-step Solution
Detailed explanation
\( B = \frac{\mu_0 I}{2 \pi r} \) \( B = \frac{(4 \pi \times 10^{-7} \text{ T m/A})(12 \text{ A})}{2 \pi (0.6 \times 10^{-3} \text{ m})} \) \( B = 4 \times 10^{-3} \text{ T} \) \( B = 4 \text{ mT} \)
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