Electric Potential Energy Video Lessons

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Problem: Four point charges form a square with sides of length d, as shown in the figure. In the questions that follow, use the constant k in place of .What would be the kinetic energy K2q of charge 2q at a very large distance from the other changes?Express your answer in terms of q, d, and appropriate constants. 

FREE Expert Solution

Electric potential energy:

U=kq1q2r

The charge 2q is initially at rest while in the system. At a large distance, the potential energy of charge 2q as part of the system is zero. From the conservation of energy:

U0 + KE0 = Uf + KEf 

The potential energy of charge 2q in the system = U0 

Uf = 0 

KE0 = 0 

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Problem Details

Four point charges form a square with sides of length d, as shown in the figure. In the questions that follow, use the constant k in place of .

What would be the kinetic energy K2q of charge 2q at a very large distance from the other changes?

Express your answer in terms of q, d, and appropriate constants. 

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