Five balls numbered $1$ to $5$ are suspended using separate threads. Pairs $(1, 2)$, $(2, 4)$ and $(4, 1)$ show electrostatic attraction, while pair $(2, 3)$ and $(4, 5)$ show repulsion. Therefore ball $1$ must be
Positively charged
Negatively charged
Neutral
Made of metal
What is called earthing ? Give importance of earthing in wiring.
When a conducting soap bubble is negatively charged then
Write the law of conservation of charge. Give one example.
What are called conductors and non-conductors ? In which free electrons are more ? Conductor or non-conductor.
The electric charge in uniform motion produces