There are 50 turns of a wire in every \( \mathrm{cm} \) length of a long solenoid. If 4 ampere c...

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There are 50 turns of a wire in every \( \mathrm{cm} \) length of a long solenoid. If 4 ampere current is flowing in the
\( \mathrm{P} \) solenoid, the approximate value of magnetic field along

W its axis at an internal point and at one end will be respectively
(1) \( 12.6 \times 10^{-3} \mathrm{Weber} / \mathrm{m}^{2}, 6.3 \times 10^{-3} \mathrm{Weber} / \mathrm{m}^{2} \)
(2) \( 12.6 \times 10^{-3} \mathrm{Weber} / \mathrm{m}^{2}, 25.1 \times 10^{-3} \mathrm{Weber} / \mathrm{m}^{2} \)
(3) \( 25.1 \times 10^{-3} \mathrm{Weber} / \mathrm{m}^{2}, 12.6 \times 10^{-3} \mathrm{Weber} / \mathrm{m}^{2} \)
(4) \( 25.1 \times 10^{-5} \mathrm{Weber} / \mathrm{m}^{2}, 12.6 \times 10^{-5} \) Weber \( / \mathrm{m}^{2} \)
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