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Practice MCAT Question - Q24 - Answer!

If the charge on a particle in an electric field is reduced to half its original value, the force exerted on the particle by the field is

A.  doubled.
B.  halved.
C.  quadrupled.
D.  unchanged.

The correct answer is (B). The electric field strength is the ratio of the force exerted on a unit charge in the field:

E = F/q

Therefore, F and q are directly proportional and linearly related.

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