One way to make a compass is to stick a magnetized needle...

Name: Problem 15, Chapter 24: Conceptual Physics
Uploaded: 2021-10-10T04:24:20-08:00
Duration: 1 min 48 s
Channel: Prabhu Ramji
Description: One way to make a compass is to stick a magnetized needle into a piece of cork and ficat it in a glass bowl full of water. The needie will align itself with the horizontal component of the Earth's magnetic field. Since the north pole of this compass is attracted northward, will the needle float toward the north side of the bowl? Defend your answer.

One way to make a compass is to stick a magnetized needle into a piece of cork and ficat it in a glass bowl full of water. The needie will align itself with the horizontal component of the Earth's magnetic field. Since the north pole of this compass is attracted northward, will the needle float toward the north side of the bowl? Defend your answer.

One way to make a compass is to stick a magnetized needle into a piece of cork and ficat it in a glass bowl full of water. The needie will align itself with the horizontal component of the Earth's magnetic field. Since the
north pole of this compass is attracted northward, will the needle float toward the north side of the bowl? Defend your answer.

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Key Concepts

Earth's Magnetic Field

Earth's magnetic field is the region around the planet where magnetic forces are observable, comprising horizontal and vertical components. It acts as a guide for magnetic materials and is essential for navigation, as compasses align with its horizontal component.

Magnetic Dipole and Torque

A magnetic dipole, like a magnetized needle, experiences a torque when placed in a magnetic field. This torque tends to orient the dipole along the field lines, aligning it with the Earth's magnetic field, but does not produce a net translational force moving the needle to any side.

Net Force versus Torque

In a uniform magnetic field, a magnetized object experiences torque that rotates it to align with the field, yet there is no net force causing it to move laterally. Movement would require a gradient or variation in the field strength, which is not present in the scenario described.

Equilibrium in Fluids

When an object floats in a fluid, it is in a state of equilibrium where buoyant forces counteract gravity. This stable equilibrium ensures that the only significant effect on a floating magnet is its rotation due to magnetic torque, rather than any directional movement within the fluid.

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