Suppose we have a large number of identical particles, very small in size. Any two of them at 10cm separation repel with a force of `3xx10^(-10)N`.
(a) If one of them is at 10 cm from a group (of very small size) of n others, how strongly do you expect it to be repelled?
(b) Suppose you measure the repulsion and find it `6 xx 10^(-6)N`. How many particles were there in the group?

Explanation

Let's solve the question step by step.

### Given:
- Force between two identical particles at a separation of 10 cm: \( F = 3 \times 10^{-10} \, \text{N} \)
- Distance from one particle to a group of \( n \) identical particles: \( r = 10 \, \text{cm} = 0.1 \, \text{m} \)

### (a) Expected Repulsion Force from the Group of Particles

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