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Question

# When a substance is kept in a magnetic field, it gets weakly repelled by the field. Which of the following represents its susceptibility?

A
0.0004
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B
4
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C
0.0004
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D
4
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Solution

## The correct option is A −0.0004The material gets repelled by the magnetic filed, this means that it gets oppositely magnetized to that of the external field. ⇒→I and →H have opposite signs. As, →I=χ →H, ∴ Magnetic susceptibility (χ) is negative for the material. Also, |I|<<|H| ⇒∣∣∣IH∣∣∣<<1 ∴|χ|<<1 So, χ is negative and |χ|<<1. Hence, option (A) is correct.

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