The right-hand screw rule is also known as?

Options

A. Maxwell Cork Screw Rule
B. Right-hand thumb rule.
C. Fleming's rule.
D. Bio-Savart Law

Explanation

To answer the question "The right-hand screw rule is also known as?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Right-Hand Screw Rule**:
The right-hand screw rule is a method used to determine the direction of the magnetic field in relation to the direction of current flow. It is often used in electromagnetism.

2. **Identify the Options**:
The options provided are:
- A) Maxwell-Kork's screw rule
- B) Right hand thumb rule
- C) Fleming's rule
- D) Byard-Sivert law

3. **Recall the Origin**:
The right-hand screw rule was developed by James Clerk Maxwell and is sometimes referred to as Maxwell-Kork's screw rule. This rule states that if you imagine turning a screw in the direction of the current, the direction in which the screw moves will indicate the direction of the magnetic field.

4. **Evaluate Each Option**:
- **Option A (Maxwell-Kork's screw rule)**: This is a correct identification of the right-hand screw rule.
- **Option B (Right hand thumb rule)**: This is a different rule used for determining the direction of force in motors.
- **Option C (Fleming's rule)**: This refers to Fleming's left-hand and right-hand rules, which are also different.
- **Option D (Byard-Sivert law)**: This is not related to the right-hand screw rule.

5. **Conclusion**:
Based on the evaluation, the correct answer is **Option A: Maxwell-Kork's screw rule**.

### Final Answer:
The right-hand screw rule is also known as **Maxwell-Kork's screw rule**.