Question

An electroscope is a device that detects charge on objects that touch it or are brought near it. John rubs a piece of cotton fabric on a plastic rod and then touches the rod to the electroscope.

What methods of charging does John use?

John charges the rod through induction, then charges the electroscope through friction.
John charges the rod through conduction, then charges the electroscope through induction.
John charges the rod through friction, then charges the electroscope through induction.
John charges the rod through friction, then charges the electroscope through conduction. abc or d

Answer 1

The correct answer is: **John charges the rod through friction, then charges the electroscope through conduction.**

Here's the reasoning:

1. **Charging the rod through friction**: When John rubs the plastic rod with a cotton fabric, he is using the method of charging by friction. This causes electrons to be transferred between the materials, resulting in the rod becoming charged.

2. **Charging the electroscope through conduction**: When the charged rod touches the electroscope, it allows charge to transfer directly from the rod to the electroscope. This process is known as conduction.

So, the answer is **d**.