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WAEC Physics 2017 Paper

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Question : 44

Total: 50

The diagram above illustrates two charged bodies, X and Y separated by a distance r. Each body has charge q and mass m. Which of the following statements about the electrostatic force

F_{e}

and gravitational force

F_{g}

acting between the bodies is correct?

$F_{e}$ is attraction while $F_{g}$ is repulsion
Both $F_{e}$ and $F_{g}$ are that of repulsion
Both $F_{e}$ and $F_{g}$ is that of attraction
$F_{e}$ is repulsion while $F_{g}$ is attraction

Solution:

Concept:

Like charges repel each other, while gravitational force between two masses is always attractive.

Explanation:

The diagram shows that body X and body Y carry the same type of charge.

Since like charges repel, the electrostatic force

F_{e}

between X and Y is repulsive.

The two bodies also have mass, and gravitational force between any two masses is always attractive.

Therefore,

F_{e}

is a repulsive force while

F_{g}

is an attractive force.

Answer:

D.

F_{e}

is repulsion while

F_{g}

is attraction.

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