AP EAMCET · PHYSICS · Magnetic Effects of Current
The magnetic field, of a given length of wire for single turn coil, at its center is . then its value for two turns coil for the same wire is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(C)
Step-by-step Solution
Detailed explanation
Magnetic field, B=μnia After turning the coils into 2 turns, n'=2n, a'=a2 ⇒B∝na ⇒B'B=n'n×aa' ⇒B'B=2nn×2aa ⇒B'B=4 ⇒B'=4B
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