. The magnetic field at the center of a 1.50-cm-diameter loop is 2.50 mT Part A

Question

.

The magnetic field at the center of a 1.50-cm-diameter loop is 2.50 mT

Part A

What is the current in the loop?

Express your answer with the appropriate units.

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 2.50 mT ?

Express your answer with the appropriate units.

.

The magnetic field at the center of a 1.50-cm-diameter loop is 2.50 mT

Part A

What is the current in the loop?

Express your answer with the appropriate units.

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 2.50 mT ?

Express your answer with the appropriate units.

Explanation / Answer

1) B = o*I/2r

so

I = (2*B*r)/o

Given:

B = 2.50 mT = 2.5*10^-3 T

d = 0.015m

So, r = d/2 = 0.0075m

So, we have

I = (2*2.5x10^-3*0.0075)/(4x10^-7) = 29.84A

2) Now B = o*I/2r so

r = o*I/(2B) = 2x10^-7*29.84/0.0025 = 2.39x10^-3m

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