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Q.

A solenoid has a core of material with relative permeability 400. the windings of solenoid are insulated from the core and carrry a current of 2A .if no.of turns per unit length is 1000, the magnetising current

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a

2A

b

8A

c

798A

d

700A

answer is C.

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Detailed Solution

B=μni=μ0ni+im;μ0μrni=μ0ni+imim=μr−1i=(400−1)×2=399×2=798A

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