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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 carry a current of 2 A. If no. of turns per unit length is 1000, the magnetising current

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a

2 A

b

8 A

c

798 A

d

700 A

answer is C.

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Detailed Solution

If i is current in solenoid and im is magnetization current

B=μni=μ0ni+im ;  μ0μrni=μ0ni+im im=μr-1i=400-1 x 2=399 x 2=798 A

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