Question

A. What must the charge (sign and magnitude) of a particle of mass 1.45 g be...

A.

What must the charge (sign and magnitude) of a particle of mass 1.45 g be for it to remain stationary when placed in a downward-directed electric field of magnitude 660 N/C ?

Use 9.81 m/s2 for the magnitude of the acceleration due to gravity.

B.

What is the magnitude of an electric field in which the electric force on a proton is equal in magnitude to its weight?

Use 1.67×10−27 kg for the mass of a proton, 1.60×10−19 C for the magnitude of the charge on an electron, and 9.81 m/s2 for the magnitude of the acceleration due to gravity.

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