How does battery generates dc electricity

answer: a battery converts chemical energy into electrical energy by a chemical reaction. a battery produces direct current (dc) electricity (electricity that flows in one direction, and does not switch back and forth).

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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.