Question

I have two coils. A and B.
I want to get voltage or current in coil B
I can keep both coils nearby and connect coil A to a battery with a switch. When I switch on and off for coil A, the magnetic field changes in B, So I get current in B.
Is there any other ways to change the magnetic field and get current in coil B without moving the coils A and B?
and there is no magnet​

Answer 1

Answer: i know

Explanation:

In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities.

Answer 2

When two circular coils A and B are placed close to each other, and the current in the coil A is changed then some current will be induced in the coil B and the magnetic field associated with it also changes. Thus the magnetic field around coil B also changes. This change in the magnetic field lines around coil B induces an electric current in it. This process is known as electromagnetic induction.