The correct answer is: D. Induction
Induction is the process of charging an uncharged body by bringing it into the vicinity of a charged body. The uncharged body will acquire a charge of the opposite sign to the charge of the charged body.
Photoelectric effect is the emission of electrons from a metal surface when light is shone on it. The electrons are emitted only if the light has a certain minimum frequency, called the threshold frequency. The higher the frequency of the light, the more energetic the electrons that are emitted.
Chemical effect is the change in the chemical properties of a substance when it is exposed to an electric field. For example, water can be decomposed into hydrogen and oxygen gas when it is exposed to a high voltage electric field.
Magnetic effect is the force that is exerted on a moving charge by a magnetic field. The force is perpendicular to both the direction of the motion of the charge and the direction of the magnetic field.
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