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

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

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

So we will have

here we know that

so we have

so we have

r = 20 units

1 the 4 is sig

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2