A long, straight wire carries a current i. Let `B_1 be the magnetic field at a point P at a distance d from the wire. Consider a section of length l of this wire such that the point P lies on a perpendicular bisector of the section. Let B_2 be the magnetic field at this point due to this section only. Find the value of d/l so that B_2 differs from B_1 by 1 %.

Explanation

To solve the problem, we need to find the ratio \( \frac{d}{l} \) such that the magnetic field \( B_2 \) at point \( P \) due to a section of length \( l \) of the wire differs from the magnetic field \( B_1 \) at point \( P \) due to the entire wire by 1%.

### Step-by-Step Solution:

1. **Magnetic Field Due to a Long Straight Wire**:
The magnetic field \( B_1 \) at a distance \( d \) from a long straight wire carrying a current \( I \) is given by:
\[
B_1 = \frac{\mu_0 I}{2\pi d}
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