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Question: A magnetising field of 2000 *A*/*m* produces a flux \(6.28 \times 10 ^ { - 4 }\)*weber* in a rod. If...

A magnetising field of 2000 A/m produces a flux 6.28×10−46.28 \times 10 ^ { - 4 }weber in a rod. If the area of cross-section is Then the relative permeability of the substance is

A

0.75×10−20.75 \times 10 ^ { - 2 }

B

1.25×1041.25 \times 10 ^ { 4 }

C

0.25

D

1.01

Answer

1.25×1041.25 \times 10 ^ { 4 }

Explanation

Solution

By using B=ϕAB = \frac { \phi } { A },