Two circular coils are concentric and lie in the same plane. the inner coil contains 170 turns of wire, has a radius of 0.0095 m, and carries a current of 8.9 a. the outer coil contains 150 turns and has a radius of 0.015 m. what must be the magnitude of the current in the outer coil, such that the net magnetic field at the common center of the two coils is zero?

Current in outer circle will be 15.826 A

Explanation:

We have given number of turns in inner coil

Radius of inner circle

Current in the inner circle

Number of turns in outer circle

Radius of outer circle

We have to find the current in outer circle so that net magnetic field will zero

For net magnetic field current must be in opposite direction as in inner circle

We know that magnetic field is given due to circular coil is given  by

For net magnetic field zero

So

i believe the answer is a

c. 7/3

step-by-step explanation:

a rational number is like pi- it is a repeating decimal.

a. is -1.8

b. 2.236068

c. 2.3333333333333333333

d.   is 3

i hope that ! =)