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

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Negatively charged

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Neutral

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Made of metal

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Solution

The correct option is C Neutral
Let us consider 1 ball has any type of charge. 1 and 2 must have different charges, 2 and 4 must have different charges i.e. 1 and 4 must have same charges but electrostatics attraction is also present in (1, 4) which is impossible.

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Similar questions

1, 2, 3, 4

5

(1, 2), (2, 4)

(4, 1)

(2, 3)

(4, 5)

1

Question 4(a) :

Look at the figures and write ‘<’ or ‘>’ between the given pairs of fractions:

$\frac{1}{6} □ \frac{1}{3}$

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