AP EAMCET · PHYSICS · Magnetic Effects of Current
A circular coil connected to a battery of emf produced a certain magnetic induction field at its centre. The coil is unwound, stretched to double its length rewound into a coil of of the original radius and connected to a battery of emf to produce same field at the centre. Then is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(A)
Step-by-step Solution
Detailed explanation
The expression for the magnetic field at the centre of a circular coil of n turns. B=μ0i2rn If length of the wire is doubled, 2 2πrn=2πr'n' 2 r n=r3n' n'=6n For the same field at the centre, μ0in2r=μ0i'n'2r'…
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