The force exerted on a charged body in an electric field depends on I. the charge on the body II. the electric…

Analyze the question: We need to find which quantities determine the force on a charged body placed in an electric field.

Concept: The electric field intensity E is defined as the force per unit charge:

E = F / q, so F = qE

where

• F = force on the charged body (N)
• q = charge on the body (C)
• E = electric field intensity (N/C or V/m)

Checking each statement:

• I. The charge on the body: True. F is directly proportional to q.
• II. The electric field intensity: True. F is directly proportional to E.
• III. The square of the mass of the body: False. Mass does not appear in F = qE. Mass affects the acceleration produced (a = F/m = qE/m), but not the force itself. The "square of the mass" has no role in any electric force formula.

So the force depends on I and II only.

Answer: Option C.

Tip: Remember F = qE. If a quantity does not appear in the formula, the force does not depend on it. Be careful with questions asking about force versus acceleration: mass matters for acceleration (a = qE/m), not for the force. Also, don't confuse this with gravitational force, where mass does matter (F = mg).