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

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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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Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)

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