Two points A and B are situated perpendicular to the axis of 4 cm long bar magnet at a distance x and 3x from its centre on opposite sides. The ratio
Two points A and B are situated perpendicular to the axis of 4 cm long bar magnet at a distance x and 3x from its centre on opposite sides. The ratio of magnetic inductions at A and B will be equal to
A. `27:1`
B. `2:9`
C. `6:8`
D. `1:9`
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Correct Answer - A
`(B_(1))/(B_(2))=((mu_(0))/(4pi)(M)/r_(1)^(3))/(mu_(0)/(4pi)(M)/(r_(2)^(3)))=(r_(2)/(r_(1)))^(3)=((3x)/(x))^(3)=(27)/(1)`
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