Two poles separated by 10 cm experiences a force of 5 mN. Find the force between them when the distance is doubled and pole strengths are doubled.

Explanation

To solve the problem step by step, we will use the formula for the force between two magnetic poles:

### Step 1: Write down the formula for the force between two magnetic poles.
The force \( F \) between two magnetic poles is given by the formula:
\[ F = \frac{\mu_0}{4\pi} \frac{m_1 m_2}{r^2} \]
where:
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