Identify the correct sttement related to the direction of magnetic moment of a planar loop.

Options

A. It is always perpendicular to the plane of the loop
B. It depends on the direction of current
C. It is obtained by right hand screw rule
D. All of the above

Explanation

To solve the question regarding the direction of the magnetic moment of a planar loop, we can break down the statements provided and analyze them step by step.

### Step 1: Understanding Magnetic Moment
The magnetic moment (\( \vec{m} \)) of a planar loop is defined by the formula:
\[ \vec{m} = I \cdot \vec{A} \]
where \( I \) is the current flowing through the loop and \( \vec{A} \) is the area vector of the loop.

### Step 2: Analyzing Statement 1
**Statement 1:** "It is always perpendicular to the plane of the loop."
- The area vector (\( \vec{A} \)) is always perpendicular to the plane of the loop. Therefore, this statement is **correct**.

### Step 3: Analyzing Statement 2
**Statement 2:** "It depends on the direction of the current."
- The direction of the magnetic moment is indeed influenced by the direction of the current. If the current direction changes, the magnetic moment direction will also change. Hence, this statement is **correct**.

### Step 4: Analyzing Statement 3
**Statement 3:** "It is obtained by the right-hand screw rule."
- The right-hand screw rule states that if you curl the fingers of your right hand in the direction of the current, your thumb will point in the direction of the magnetic moment. This confirms that this statement is also **correct**.

### Step 5: Conclusion
Since all three statements are correct, the answer to the question is:
**All of the above.**

### Final Answer:
The correct statement related to the direction of the magnetic moment of a planar loop is: **All of the above.**

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