You hold a ruler that has a charge on its tip 2 cm above a small piece of tissue paper to see if it can be picked up. the ruler has −14 µc of charge. the tissue has 3 g of mass. what is the minimum charge required to pick up the tissue paper?

Explanation:

It is known that the relation between force and mass is as follows.

                            F = mg .......... (1)

where,    F = force

              m = mass

              g = acceleration due to gravity

Also,     F = .......... (2)  

Therefore, equating equations (1) and (2) as follows.

                = mg

Putting the given values into the above formula as follows.

              = mg

            = 3 g \times 9.8[/tex]

              C

Therefore, the minimum charge required to pick up the tissue paper is C.

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