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A piece of tape is pulled from a spool and lowered toward a 190-mg scrap of paper. Only when the tape comes within 8.0 mm is the electric force magnitude great enough to overcome the gravitational force exerted by Earth on the scrap and lift it.
Determine the magnitude and direction of the electric force exerted by the tape on the paper at this distance

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Answer:

0.0018639 N, upwards

Explanation:

m = Mass of paper = 190 mg

g = Acceleration due to gravity = 9.81 m/s²

The electric force will be the weight of the paper itself

[tex]F=mg\\\Rightarrow F=190\times 10^{-6}\times 9.81\\\Rightarrow F=0.0018639\ N[/tex]

The magnitude of the electric force is 0.0018639 N.

The gravitational force is acting downwards but the electrical force is going against the gravitational force. Hence the direction of the electrical force is upwards.

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