JEE Mains · Physics · STD 12 - 5. Magnetism and matter
The magnetic intensity at the centre of a long current carrying solenoid is found to be \(1.6 \times 10^3 Am ^{-1}\). If the number of turns is 8 per cm, then the current flowing through the solenoid is \(................\,A\)
- A \(9\)
- B \(2\)
- C \(5\)
- D \(6\)
Answer & Solution
Correct Answer
(B) \(2\)
Step-by-step Solution
Detailed explanation
\(H =\frac{ B }{\mu_0}=\frac{\mu_0 ni }{\mu_0}= ni\) \(i =\frac{ H }{ n }=\frac{1.6 \times 10^3}{\left(\frac{8}{10^{-2}}\right)}=2\,A\)
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