A long solenoid has 200 turns per cm and carries a current I . The magnetic field at its…
Physics · JEE Main · NTA Exams — Magnetic Effects of Current and Magnetism
A long solenoid has 200 turns per cm and carries a current \(\text { I }\). The magnetic field at its centre is 6.28 x 10-2 weber/m2. Another long solenoid has 100 turns per cm and it carries a current \(I / 3\). The value of the magnetic filed at its centre is
- \(1.05 \times 10^{-2} \text { weber } / \mathrm{m}^{2}\)
- \(1.05 \times 10^{-5} \text { weber } / \mathrm{m}^{2}\)
- \(1.05 \times 10^{-3} \text { weber } / \mathrm{m}^{2}\)
- \(1.05 \times 10^{-4} \text { weber } / \mathrm{m}^{2}\)
Answer
(A) 1.05 10^ -2 weber / m ^ 2
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