Which of the following conditions must be met to have electric current flow through a circuit?
The circuit must be a closed loop.
The circuit must have a source of electric charges (energy).
A potential difference through the circuit must exist.
All of the above conditions are necessary for electric current flow.

all of the above conditions are necessary for electric current to flow

Explanation:

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unlike poles attract

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.