(20%) Problem 3: Common transparent adhesive tape becomes charged when pulled fr

Question

(20%) Problem 3: Common transparent adhesive tape becomes charged when pulled from a dispenser. If one piece is placed above another, the repulsive force can be great enough to support the top piece's weight Assuming equal point charges as an approximation, calculate the magnitude of each charge, in coulombs, if the electrostatic force is great enough to support the weight of a 0.75 mg piece of tape held 1.25 cm above another Grade Summary Deductions 80 Potential Late work % 0% Late Potential 0% 20% sin cos0 cotan asin coso Submissions Attempts remaining: 4 (20% per attempt) detailed view atan)acotan)sinh( cotanhO 0 cos END Degrees O Radians 20% Submit Hint I give up! Hints: 10% deduction per hint. Hints remaining: 2 Feedback: 10% deduction per feedback.

Explanation / Answer

Here ,

let each charge is q

as electric force = k * q^2/d^2

0.75 * 10^-6 * 9.8 = 9 *10^9 * q^2/0.0125^2

solving for q

q = 3.57 *10-10 C

each charge is 3.57 *10-10 C

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