A long solenoid has $200$ turns per $cm$ and carries a current $i.$ The magnetic field at its center is $6.28 \times {10^{ - 2}}\,\,\,Weber/{m^2}.$ Another long solenoid has $100$ turns per $cm$ and it carries a current ${i \over 3}$. The value of the magnetic field at its center is

Question

$1.05 \times {10^{ - 2}}\,\,Weber/{m^2}$

$1.05 \times {10^{ - 5}}\,\,Weber/{m^2}$

$1.05 \times {10^{ - 3}}\,\,Weber/{m^2}$

$1.05 \times {10^{ - 4}}\,\,Weber/{m^2}$

Solution

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