1.

The energy stored in a magnetic field of length l metre and of cross-section A sq-m is:

A. \(E=\frac{1}{2} \times {{ A}\frac{N^2}{μl}}\times{I^2}\) J
B. \(E=\frac{1}{2} \times {{μ A}\frac{N^2}{l}}\times{I^2}\) J
C. \(E=\frac{1}{2} \times {{μ l}\frac{N^2}{A}}\times{I^2}\) J
D. \(E=\frac{1}{2} \times {{μ A}\frac{N}{l}}\times{I^2}\) J
Answer» C. \(E=\frac{1}{2} \times {{μ l}\frac{N^2}{A}}\times{I^2}\) J


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