The phenomenon in which electric current is generated by varying magnetic fields is appropriately- called

Options

A. electromagnetic wave
B. electromagnetic flux
C. electromagnetic Induction
D. displacements of Insulator

Answer

To solve the question, we need to identify the phenomenon in which electric current is generated by varying magnetic fields. Let's break it down step by step:

### Step-by-Step Solution:

1. **Understanding the Concept**:
- The question asks about the phenomenon where electric current is produced due to changes in magnetic fields. This concept is rooted in electromagnetic theory.

2. **Magnetic Flux**:
- Magnetic flux (Φ) is defined as the product of the magnetic field (B) and the area (A) it penetrates, mathematically expressed as Φ = B · A. When the magnetic field changes, the magnetic flux through a surface also changes.

3. **Faraday's Law of Electromagnetic Induction**:
- According to Faraday's law, a change in magnetic flux over time induces an electromotive force (EMF) in a circuit. The induced EMF (E) is proportional to the rate of change of magnetic flux, given by the formula:
\[ E = -\frac{dΦ}{dt} \]
- This means that if the magnetic field is varying, the rate of change of magnetic flux (dΦ/dt) is not zero, leading to the generation of EMF.

4. **Induced Current**:
- When an EMF is induced in a closed circuit, it causes an electric current to flow through the circuit. This is a direct consequence of the induced EMF acting against the resistance in the circuit.

5. **Identifying the Phenomenon**:
- The question specifically asks for the name of the phenomenon where electric current is generated by varying magnetic fields. The correct term for this phenomenon is "Electromagnetic Induction".

6. **Conclusion**:
- Based on the understanding of the principles of electromagnetic induction and the definitions provided, the answer to the question is:
**Electromagnetic Induction**.

### Answer:
The phenomenon in which electric current is generated by varying magnetic fields is appropriately called **Electromagnetic Induction**.