A current carrying wire in the neighborhood produces

Options

A. No field
B. Electric field only
C. Magnetic field only
D. Electric and magnetic fields

Answer

To solve the question regarding what a current-carrying wire produces in its neighborhood, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept**: A current-carrying wire generates a magnetic field around it. This is a fundamental principle in electromagnetism.

2. **Magnetic Field Calculation**: The magnetic field (B) produced by a long straight current-carrying wire at a distance (r) from the wire can be calculated using the formula:
\[ B = \frac{\mu_0 I}{2 \pi r} \]
where:
- \( B \) is the magnetic field,
- \( \mu_0 \) is the permeability of free space,
- \( I \) is the current flowing through the wire,
- \( r \) is the distance from the wire.

3. **Direction of the Magnetic Field**: The direction of the magnetic field around the wire can be determined using the right-hand rule. If you point your thumb in the direction of the current, your fingers will curl in the direction of the magnetic field lines.

4. **Electric Field Consideration**: While the current-carrying wire produces a magnetic field, it does not produce an electric field in the surrounding space unless there is a change in the current (i.e., if the current is varying with time). The electric field is produced by stationary charges or by changing magnetic fields (according to Faraday's law of electromagnetic induction).

5. **Conclusion**: Therefore, the primary effect of a current-carrying wire in its neighborhood is the production of a magnetic field, and not an electric field unless there are other conditions present (like changing current).

### Final Answer:
A current-carrying wire in the neighborhood produces a magnetic field.