What must the charge sign and magnitude of a particle of, Ask an Expert

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Q. What must the charge (sign and magnitude) of a particle of mass 1.44 g be for it to remain stationary when placed in a downward-directed electric field of magnitude 660 N/C?

Use 9.81 m/s^2 for the magnitude of the acceleration due to gravity.

Q. A uniform bar 10 feet long and weighing 5.0 lb. is supported by a fulcrum 3.0 feet from the left end. If a 12-lb load is hung from the left end, what downward pull at the right end is necessary to hold the bar in equilibrium? with what force does the fulcrum push up against the bar?

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