A current of $5$ $ampere$ is flowing in a wire of length $1.5$ $metres$. A force of $7.5\, N$ acts on it when it is placed in a uniform magnetic field of $2\, Tesla$. The angle between the magnetic field and the direction of the current is......$^o$
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(a) $F = Bil\sin \theta \Rightarrow 7.5 = 2 \times 5 \times 1.5\sin \theta \Rightarrow \theta = 30^\circ $
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