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(D) Electromagnetism is the physical phenomenon where an electric current produces a magnetic field.$1$. $A$ transformer works on the principle of mut

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(D) Electromagnetism is the physical phenomenon where an electric current produces a magnetic field.$1$. $A$ transformer works on the principle of mutual induction,which is a direct application of electromagnetic induction.$2$. An electric motor works on the principle that a current-carrying conductor placed in a magnetic field experiences a force (Lorentz force).$3$. $A$ galvanometer works on the principle that a current-carrying coil placed in a magnetic field experiences a torque.Since all these devices rely on the interaction between electricity and magnetism,they are all based on the principles of electromagnetism.

The principle of which of these devices is based on electromagnetism?

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