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The time period of bar magnet is doubled when magnetic field is reduced

The time period of bar magnet is doubled when magnetic field is reduced by same amount. If initial magnetic field is 0.4 x 10⁻⁴ T then find out decrease in the magnetic field

Options

(a) 0.12 x 10⁻⁵
(b) 0.3 x 10⁻⁴
(c) 0.4 x 10⁻⁵
(d) 12 x 10⁻⁵

Correct Answer:

0.3 x 10⁻⁴

Explanation:

No explanation available. Be the first to write the explanation for this question by commenting below.

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