Q.

A short magnetic needle is pivoted in a uniform magnetic field of strength 1 T. When another magnetic field of strength 3 T is applied to the needle in a perpendicular direction, the needle deflects through an angle θ, where θ is

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a

30o

b

45o

c

90o

d

60o

answer is D.

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Detailed Solution

In balanced condition, B2=B1 tanθ⇒tanθ=31⇒θ=60o
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A short magnetic needle is pivoted in a uniform magnetic field of strength 1 T. When another magnetic field of strength 3 T is applied to the needle in a perpendicular direction, the needle deflects through an angle θ, where θ is