Question

If the strength of the magnetic field at A is 200 units and the strength of the magnetic field at B is 50 units, what is the

distance to B?
5
m
2008 Odysore, ne
20 units
400 units
100 units
10 units

Answer 1

100

Step-by-step explanation:

Answer 2

Distance for magnetic field at B position is r = 20 unit

Step-by-step explanation:

As we know that magnetic field due to long wire is given as

`B = (\mu_0 i)/(2\pi r)`

so here we can see that magnetic field is inversely depending on the distance from the wire

So we will have

`(B_2)/(B_1) = (r_1)/(r_2)`

here we know that

`B_1 = 200 unit`

`B_2 = 50 unit`

`r_1 = 5 unit`

so we have

`(50)/(200) = (5)/(r)`

so we have

r = 20 units