# Torque on a Current Loop In a Magnetic Field & Magnetic Dipole Moment - Physics | Summary and Q&A

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December 20, 2017
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The Organic Chemistry Tutor
Torque on a Current Loop In a Magnetic Field & Magnetic Dipole Moment - Physics

## TL;DR

A current of 3 amps flows through a 10cm by 10cm square coil with 20 loops, and the maximum torque can be calculated using the equation n𝑖𝐴𝐵sinθ.

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### Q: How can the maximum torque of a square coil with multiple loops be calculated?

The maximum torque can be calculated using the equation n𝑖𝐴𝐵sinθ, where n is the number of loops, i is the current, A is the area of the coil, B is the strength of the magnetic field, and θ is the angle between the normal line of the coil and the magnetic field.

### Q: What factors affect the maximum torque of a coil?

The number of loops, the current, the area of the coil, the strength of the magnetic field, and the angle between the normal line of the coil and the magnetic field all affect the maximum torque.

### Q: How does the direction of the current affect the direction of the force on the coil?

The direction of the force on the coil depends on the direction of the current. Using the right-hand rule, if the current is going out of the page, the force is north. If the direction of the current is reversed, the direction of the force will also be reversed.

### Q: When does the maximum torque occur?

The maximum torque occurs when the magnetic field is perpendicular to the normal line of the coil. In this position, the angle θ is 90 degrees, and sinθ is equal to 1, maximizing the torque.

## Summary & Key Takeaways

• A current of 3 amps flows through a 10cm by 10cm square coil with 20 loops of wires.

• The maximum torque that can be produced when the face of the coil is perpendicular to a magnetic field of 1 Tesla can be calculated using the equation n𝑖𝐴𝐵sinθ.

• The torque is a result of the magnetic force acting on the moving charges in the wire.