Assertion: If a compass needle be kept at magnetic north pole of the earth, the compass needle may stay in way direction.
Reason: Dip needle will stay vertical at the north pole of earth.

Options

A. If both the assertion and reason are true and reason is a true explanation of the assertion.
B. If both the assertion and reason are true but the reason is not the correct explanation of assertion.
C. If the assertion is true is true but reason is false.
D. If both the assertion and reason are false.

Explanation

To solve the given assertion and reason question, we will analyze both the assertion and the reason step by step.

### Step 1: Understanding the Assertion
The assertion states that if a compass needle is kept at the magnetic north pole of the Earth, it may stay in any direction.

- At the magnetic north pole, the magnetic field lines are vertical. This means that the compass needle, which is a small magnet, will experience a strong magnetic force that pulls it vertically downward.

### Step 2: Understanding the Reason
The reason provided states that the dip needle will stay vertical at the north pole of the Earth.

- A dip needle is a type of compass that is designed to measure the angle of dip, which is the angle that the magnetic field makes with the horizontal plane. At the magnetic north pole, the angle of dip is 90 degrees, meaning the dip needle points straight down.

### Step 3: Analyzing the Relationship
Now, we need to analyze the relationship between the assertion and the reason.

- The assertion claims that the compass needle may stay in any direction, which is incorrect. At the magnetic north pole, the compass needle will not point horizontally; instead, it will align itself vertically due to the strong magnetic field.
- The reason correctly states that the dip needle will stay vertical at the north pole, which supports the idea that the compass needle will not point in any horizontal direction.

### Conclusion
- The assertion is **false** because the compass needle does not stay in any direction at the magnetic north pole; it points vertically downwards.
- The reason is **true** because it accurately describes the behavior of a dip needle at the magnetic north pole.

### Final Answer
- The assertion is false, and the reason is true.

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