A solenoid of turns carries current I while another -solenoid of same length and of 3 n turns pa.rries cur reot 4I. What is the ratio of the magnetic strengths of the two solenoids?

Explanation

To find the ratio of the magnetic strengths of the two solenoids, we can follow these steps:

### Step 1: Understand the formula for magnetic strength
The magnetic strength (magnetic field inside a solenoid) is given by the formula:
\[ B = \mu_0 \cdot \frac{N \cdot I}{L} \]
where:
- \( B \) is the magnetic strength,
- \( \mu_0 \) is the permeability of free space (a constant),
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