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Hi, i am learning electronic, and i can't figure that one out.

I know that "when a fluctuating electric current flow through a wire, it generates a magnetic field", is the reverse true. Can you use a magnetic field to modulate an electric current. If it's the case, can i use this in a circuit with a constant load like a class A amplifier?

I'll appreciate if you could help, thanks.

I know that "when a fluctuating electric current flow through a wire, it generates a magnetic field", is the reverse true. Can you use a magnetic field to modulate an electric current. If it's the case, can i use this in a circuit with a constant load like a class A amplifier?

I'll appreciate if you could help, thanks.