The couple acting on a magnet of length 10cm and pole strength 15A-m, kept in a field of `B=2xx10^(-5)`, at an anlge of `30^(@)` is
The couple acting on a magnet of length 10cm and pole strength 15A-m, kept in a field of `B=2xx10^(-5)`, at an anlge of `30^(@)` is
A. `1.5xx 10^(-5)`N-m
B. `1.5 xx 10^(-3)`N-m
C. `1.5 xx 10^(-2) N-m`
D. `1.5 xx 10^(-6)N-m`
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Correct Answer - A
As ,` tau=MB sin theta =(mxx 2l) xx 2 xx 10^(-5) sin 30^@`
`= 15 xx 10 xx 10^(-2) xx 2 xx 10^(-5) xx (1)/(2)`
`= 1.5 xx 10^(-5)`N-m
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