When a charged glass rod rubbed with silk cloth is brought near a negatively charged plastic straw, there is an attraction between the two. What can be said about the glass rod?

Positive

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Negative

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Neutral

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The charge on the glass rod cannot be determined.

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Solution

The correct option is A
Positive

Like charges repel whereas unlike charges attract. So, if two charged bodies are attracting towards each other, it means that they are oppositely charged.
Here, it is given that plastic straw is negatively charged. So, glass rod must have a positive charge because it is attracted towards the negatively charged straw.

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Q. What happens when charged glass rod is brought near a charged plastic straw after being rubbed with silk?

When a glass rod is rubbed with a piece of silk cloth, then :

(a) the glass rod and silk cloth both acquire the positive charge.

(b) the glass rod becomes positively charged while the silk cloth has a negative charge.

(d) the glass rod becomes negatively charged while the silk cloth has a positive charge.

When two charged glass rods, after being rubbed with a silk cloth are brought towards each other, they ___.

A glass rod rubbed with silk is brought near the disc of a negatively charged gold leaf electroscope. The divergence of its leaves will :

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