Electric Bell Circuit Deactivation

Steps:

• Battery disconnection interrupts current flow in the circuit.
• Electromagnet loses magnetic field without current.
• Iron armature, no longer attracted, falls due to gravity.
• Bell stops ringing as the striker no longer vibrates against it.

Why A is correct:

• Electromagnetic induction law: No current means no magnetic force, so armature falls and ringing ceases.

Why the others are wrong:

• B: Armature falls, not moves up, without magnetic attraction.
• C: Armature falls and bell stops, not the reverse.
• D: Bell stops when armature falls, not continues ringing.

Final answer: A