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There are $50$ $turns$ of a wire in every $cm$ length of a long solenoid. If $4\, ampere$ current is flowing in the solenoid, the approximate value of magnetic field along its axis at an internal point and at one end will be respectively
  • A$12.6 \times {10^{ - 3}}\,Weber/{m^2},\;6.3 \times {10^{ - 3}}\,Weber/{m^2}$
  • B$12.6 \times {10^{ - 3}}\,Weber/{m^2},\;25.1 \times {10^{ - 3}}\,Weber/{m^2}$
  • C$25.1 \times {10^{ - 3}}\,Weber/{m^2},\;12.6 \times {10^{ - 3}}\,Weber/{m^2}$
  • D$25.1 \times {10^{ - 5}}\,Weber/{m^2},\;12.6 \times {10^{ - 5}}\,Weber/{m^2}$
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