1. Describe, with 2-3 sentences, two instances that you have noticed in your eve

Question

1. Describe, with 2-3 sentences, two instances that you have noticed in your everyday life when the fact that matter can become charged was evident to you.

3. Consider these two metal spheres on an insulating surface. The sphere on the left has an excess of negative charges. The sphere on the right is electrically neutral. Select all the cases in which the right sphere becomes charged (either positively or negatively). I. You allow the two spheres to contact each other. II. You place a piece of metal on top of the spheres, connecting them. III. You place a piece of wood on top of the spheres, connecting them. IV. You allow the two spheres to contact each other and then you connect the right sphere to the earth with a wire (this is called “grounding"). You bring the left sphere close to but not touching the right sphere and connect the right sphere to ground. You disconnect the right sphere from ground and move the left sphere away. V. a) I and II only b) I, II, and V only c) I, II, IV, and V only d) All of the above

Explanation / Answer

I)

This will share the charge by conduction and right sphere becomes negative

II)

This will share the charge by conduction and right sphere becomes negative

III)

This will not share charge as wood is bad conductor

IV)

grounding will remove the charge from right sphere. So, it will not have charge

V)

When we bring them close, right sphere become polarised

When connected to ground, negative charge from right sphere will flow to ground but positive charge will be attracted by left sphere and hence left one will be positively charged

Answer: b

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