Physics

with this one i'm confused i'm not sure if it's b or d

The current in a solenoid is changed from 1.1 A to 4.4 A. By what factor does the magnitude of the magnetic field inside the solenoid increase?

2

4

0.5

0.25

1.1/4.4= 0.25

0r

4.4/1.1= 4

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