15. A positively charged particle moves from a position near a negativelv charge
ID: 2033282 • Letter: 1
Question
15. A positively charged particle moves from a position near a negativelv charged point source to a position near a second negatively charged point source. The new point source has a greater A. Work was done on the positive charge and the charge has gained B. Work was done on the positive charge and the charge has lost potential C. Work was done by the positive charge and the charge has gained D. Work was done by the positive charge and the charge has lost potential potential energy. energy potential energy. energy 16. A positive charge is placed in the center of four source charges as shown below. Which of the following statements is accurate? A. The positive central charge experiences zero net electric force, is at a B. The positive central charge experiences zero net electric force, is at a C. The positive central charge experiences a positive net electric force, is at a D. The positive central experiences a positive net electric force, is at a position of zero potential, and has zero electric potential energy. position with a positive potential, and has a positive potential energy, position with a positive potential, and has a positive potential energy, position with zero potential, and has zero potential energy.Explanation / Answer
15)
Because of the fact that every system tends to decrease its potential energy if left on its own, the potential energy has to be decreased. So, work should have been done by the positive charge.
Correct option is (D).
16)
If the magnitude of all the charges is same, then the correct option is (C) because lower +ve charges exert a net force in upward direction(+ve direction) as do the upper negative charges because like charges repel and unlike charges attract. Also, potential at the location of the +ve charge at the center due to the corner positive charges cancel the potential due to the negative corner charges(potential is a scalar quantity). Potential energy is accordingly zero as well.
17)
These are potential surfaces of two positive charges. So, the correct option is (A).
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