Question

how does charging by conduction compare with charging by induction?
a charged object is needed in conduction but not in induction.
two neutral objects are needed in conduction but not in induction.
objects must touch in induction but not in conduction.
oppositely charged objects form in induction but not in conduction.

Explanation:

1. Analyze each option:

• Option 1: Both conduction and induction need a charged object. In induction, a charged object is used to influence the charge distribution, so this is wrong.
• Option 2: Conduction requires a charged and a neutral object (they touch), induction also involves a charged and a neutral object (no touch), so this is wrong.
• Option 3: In conduction, objects touch; in induction, they don't. So this statement is reversed and wrong.
• Option 4: In induction, a charged object causes a separation of charge in a neutral object, creating opposite charges (e.g., a positive object near a neutral conductor makes one side negative, one side positive). In conduction, the neutral object gains the same charge as the charged object (e.g., a positive object touches a neutral object, the neutral object becomes positive), so opposite charges form in induction but not in conduction. This is correct.

Answer:

D. Oppositely charged objects form in induction but not in conduction. (Note: Assuming the last option is D, as the options are presented with circles and the last one is "Oppositely charged objects form in induction but not in conduction.")