We can charge a metal sphere positively without touching it by:

1. Conduction

2. Induction

3. Friction

4. Both (1) and (2)

Subtopic: Â Electric Charge |
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If $$10^9$$ electrons move out of a body to another body every second, how much time approximately is required to get a total charge of $$1$$on the other body?
1. $$200$$ years
2. $$100$$ years
3. $$150$$ years
4. $$250$$ years

Subtopic: Â Electric Charge |
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The amount of positive and negative charges in a cup of water ($$250$$ g) are respectively:

 1 $$1.6 \times10^9$$ C, $$1.4 \times10^9$$ C 2 $$1.4 \times10^9$$ C, $$1.6 \times10^9$$ C 3 $$1.34 \times10^7$$ C, $$1.34 \times10^7$$ C 4 $$1.6 \times10^8$$ C, $$1.6 \times10^7$$ C
Subtopic: Â Electric Charge |
Â 68%
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