Rankers Physics

Uncategorized: Practice Problem & Solution

12. A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It: (2012 Pre)
Will become rigid showing no movement
Will stay in any position
Will stay in north-south direction only
Will stay in east-west direction only

Solution Explained:

To solve this problem, we apply the core principles of Uncategorized. Understanding the underlying formula is key to arriving at the correct answer below:

At the geomagnetic poles, the horizontal component of Earth's magnetic field is zero ($B_H = 0$). Since the needle is constrained to move only in the horizontal plane, there is no horizontal restoring torque, so it can stay in any direction.

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