Question

The strength of a magnetic field around a wire carrying a current of 20 A is 0.004 T. What is the strength of the magnetic field if the current is changed to 40 A ?

Answer 1

Given the increased current, the strength of the magnetic field around the wire carrying the current increases to 0.008T

What is the strength of the magnetic field if the current is changed to 40 A ?

Given that;

First scenario

• Strength of magnetic field B = 0.004T

• Current A = 20A

Second scenario

• Strength of magnetic field B' = ?

• Current I' = 40A

First, we determine the strength of the magnetic field.

B/I = B'/I'

0.004T/20A = B'/40A

B' = ( 0.004T × 40A ) / 20A

B' = 0.16AT / 20A

B' = 0.008T

Given the increased current, the strength of the magnetic field around the wire carrying the current increases to 0.008T

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