NECO 2004 Physics · Question 41

In which of these fields are repulsive forces NOT experienced? I. Magnetic field II. Gravitational field III. Electric field

Options

A.I only
B.II only
C.III only
D.I and III only
E.II and III only

Answer: B. II only

Explanation written with AI and checked against the answer key

Analyze the question: We need the field in which repulsive forces are never experienced, meaning the force is always attractive.

Concept:

Magnetic field: Like poles repel and unlike poles attract. So repulsion does occur.
Electric field: Like charges repel and unlike charges attract. So repulsion does occur.
Gravitational field: Masses always attract one another. No gravitational repulsion has ever been observed, because mass is only "positive".

Step-by-step:

Magnetic field (I): repulsion between like poles, so repulsion is experienced.
Gravitational field (II): only attraction, so repulsion is NOT experienced.
Electric field (III): repulsion between like charges, so repulsion is experienced.

Only the gravitational field has no repulsive forces, so the answer is II only.

Answer: B

Tip: Remember "Gravity only pulls." Magnets and charges have two kinds (N/S, +/−), so they can both attract and repel. Gravity has only one kind of "charge" (mass), so it only attracts. In "NOT" questions, always find the odd one out.

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