The magnetic field at the center of a 1.50-cm-diameter loop is 2.70 mt . part a. what is the current in the loop?
part b. a long straight wire carries the same current you found in part a. at what distance from the wire is the magnetic field 2.70 mt ?

Explanation:

It is given that,

Diameter of the circular loop, d = 1.5 cm

Radius of the circular loop, r = 0.0075 m

Magnetic field,

(A) We need to find the current in the loop. The magnetic field in a circular loop is given by :

I = 32.22 A

(b) The magnetic field on a current carrying wire is given by :

r = 0.00238 m

Hence, this is the required solution.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6