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

Answer:

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

Explanation:

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

$B = \frac{\mu_0 i}{2\pi r}$

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

So we will have

$\frac{B_2}{B_1} = \frac{r_1}{r_2}$

here we know that

$B_1 = 200 unit$

$B_2 = 50 unit$

$r_1 = 5 unit$

so we have

$\frac{50}{200} = \frac{5}{r}$

so we have

r = 20 units

Answer 2

Answer:

100

Explanation: