Physics
Grade-9
Easy
Question
A small positive charge is moved from Q to P. The work done on the charge is
- Negative
- Positive
- Zero
- Cannot be determined
Hint:
Work done is negative of change in potential energy. (W= -ΔPE)
The correct answer is: Positive
- The work done will be equal to the negative change in potential energy.
- Potential energy(U) is inversely proportional to the distance between the two charges.
- Since, RQ > RP.
- Therefore, Up > UQ
- The potential energy will be negative in taking a charge from Q to P(Since, potential energy at P is greater).
- Hence, the work done will be positive.
- So, the correct option is b.
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