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The effective length of magnet is 31.4cm...

The effective length of magnet is 31.4cm and its pole strength is 0.8Am. The magnetic moment, if it is bent in the form of a semicircle in `A-m^(2)`.

A

1.2

B

1.6

C

0.16

D

0.12

Text Solution

Verified by Experts

The correct Answer is:
C
The effective length of magnet =31.4cm
Pole strength,m=0.8Am
Length of semi-circle=`pi(D)/(2)=l`
where, D=diameter of circle
`Rightarrow D=(2l)/(4)=(2xx31.4xx10^(2))/(3.14)Rightarrow D=20xx10^(-12)m`
Now the magnetic moment
`" " ml-mD=0.8xx20xx10^(-2)`
`" " 16xx10^(-2)=0.16A-m^(2)`
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