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Q. A flat circular mirror of radius 0.150 m is lying on the floor. Centered above the mirror, at a height of 0.870 m, is a light source. Calculate the diameter of the bright circular spot formed on the 2.80 m high ceiling by the light reflected from the mirror.

Q. What must the charge (sign and magnitude) of a 1.40-g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 660?

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