JEE Main 2016 · 3 Apr · Shift 1 · Physics Q16

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PhysicsSingle correct+4 / -1Question 16 of 90

Hysteresis loops for two magnetic materials A and B are given below :

These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use :

Two B-H hysteresis loops: (A) a wide, nearly rectangular loop with large retentivity and coercivity; (B) a narrow, slanted loop with small coercivity.

A for electric generators and transformers.

A for electromagnets and B for electric generators.

A for transformers and B for electric generators.

B for electromagnets and transformers.

Answer and worked solution

Official answer: D

A has a wide loop (high retentivity and coercivity), suited to permanent magnets such as those in generators. B has a narrow loop (low hysteresis loss, easily magnetised and demagnetised), suited to transformer cores and electromagnets.

Topics:Hysteresis Magnetic materials

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JEE Main 2016 · 3 Apr · Shift 1, Physics question 16