The distance covered is 4d.
What is the distance?
- Distance is a measure of how far apart two objects or locations are using numbers.
- The distance can refer to a physical length or an estimate based on other factors in both daily language and physics (e.g. "two counties over").
- The terms "distance from A to B" and "distance from B to A" are frequently used interchangeably.
- A distance function or metric is a technique to describe what it means for components of space to be "near to" or "far away" from each other in mathematics.
- It is a generalization of the idea of physical distance. Distance is a non-numerical unit of measurement in psychology and the social sciences; psychological distance is the separation of an object from itself along dimensions including time, space, and isolation.
We know that
the magnetic field is inversely proportional to distance.
[tex]\dfrac{B_1}{B_2} = \dfrac{D_2}{D_1}[/tex]
[tex]\dfrac{20}{5} = \dfrac{D_2}{d}[/tex]
[tex]D_2 = 4d[/tex]
To learn more about distance with the given link
https://brainly.com/question/15172156
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