The effect of magnetic field on stationary charge Is

Options

A. maximum
B. minimum but not zero
C. maximum but not infinity
D. zero

Answer

To solve the question regarding the effect of a magnetic field on a stationary charge, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept**:
- A magnetic field affects moving charges, but it does not exert a force on stationary charges. This is a fundamental principle in electromagnetism.

2. **Identifying the Situation**:
- We are given a stationary charge (let's denote it as \( q \)). Since the charge is at rest, we need to analyze how a magnetic field interacts with it.

3. **Magnetic Field and Stationary Charge**:
- According to the Lorentz force law, the force \( \mathbf{F} \) on a charge \( q \) moving with velocity \( \mathbf{v} \) in a magnetic field \( \mathbf{B} \) is given by:
\[ \mathbf{F} = q(\mathbf{v} \times \mathbf{B}) \]
- If the charge is stationary, then its velocity \( \mathbf{v} = 0 \).

4. **Calculating the Force**:
- Substituting \( \mathbf{v} = 0 \) into the equation:
\[ \mathbf{F} = q(0 \times \mathbf{B}) = 0 \]
- This shows that the force acting on the stationary charge due to the magnetic field is zero.

5. **Conclusion**:
- Since there is no force acting on the stationary charge from the magnetic field, we conclude that the effect of the magnetic field on a stationary charge is zero.

6. **Final Answer**:
- Therefore, the correct option is **0**.