The drawing shows a thin, uniform rod that has a length of 0.45 m and a mass of

Question

The drawing shows a thin, uniform rod that has a length of 0.45 m and a mass of 0.080 kg. This rod lies in the plane of the screen and is attached to the floor by a hinge at point P. A uniform magnetic field of 0.25 T is directed perpendicularly into the plane of the screen. There is a current I = 3.8 A in the rod, which does not rotate clockwise or counter-clockwise. Find the angle ?. (Hint: The magnetic force may be taken to act at the center of gravity.)

The drawing shows a thin, uniform rod that has a length of 0.45 m and a mass of 0.080 kg. This rod lies in the plane of the screen and is attached to the floor by a hinge at point P. A uniform magnetic field of 0.25 T is directed perpendicularly into the plane of the screen. There is a current I = 3.8 A in the rod, which does not rotate clockwise or counter-clockwise. Find the angle ?. (Hint: The magnetic force may be taken to act at the center of gravity.)

Explanation / Answer

F=ILBsin(theta)

now F=(m/2)g

sin(theta)=mg/2ILB

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