**Step-by-Step Solution:**
1. **Identify the Sources of Magnetic Fields**: To answer the question, we need to identify different sources that can produce magnetic fields.
2. **First Source - Current Carrying Conductor**: One of the primary sources of magnetic fields is a current-carrying conductor. When an electric current flows through a wire, it generates a magnetic field around it. The direction of the magnetic field can be determined using the right-hand thumb rule.
3. **Second Source - Electromagnet**: The second source of magnetic fields is an electromagnet. An electromagnet is created by winding a wire into a coil and passing an electric current through it. This coil generates a magnetic field, and its strength can be increased by adding a ferromagnetic core (like iron) inside the coil.
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