MCQ
An $AC$ generator is a device which converts:
- AElectrical energy to mechanical energy.
- BHeat energy to electrical energy.
- CHeat energy to light energy.
- ✓Mechanical energy to electrical energy.
An $AC$ generator converts mechanical energy into electrical energy, while a motor does the opposite $-$ it converts electrical energy into mechanical energy. Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.
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| List $I$ | List $II$ |
| $(A)$ Microwave | $(I)$ $400\,nm$ to $1\,nm$ |
| $(B)$ Ultraviolet | $(II)$ $1\,nm$ to $10^{-3}\,nm$ |
| $(C)$ $X-$Ray | $(III)$ $1\,mn$ to $700\,nm$ |
| $(D)$ Infra-red | $(IV)$ $0.1\,m$ to $1\,mm$ |
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