Electromagnetism 2 : Force on a current carrying conductor

Force on a current carrying conductor

By Akram Varqid

Revision

Magnets

You must already know about type of magnets

How to change strength of magnet

​How to draw magnetic field depending on strength

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Results in magnetic force

In force, direction is important

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Two​ force on the same direction will add and opposite direction will subtract

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1 Magnetic field (B)

Current flowing in yellow have magnetic field

It is placed in magnetic field by bar magnet B (Bottom north)​

Both magnetic field will combine​

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2 Magnetic field (2B)

Current flow on yellow rod upward. So the m field left of rod is up and right of rod is down (clockwise) When combined, m field stronger at left (same direction B) than right (opposite B)

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2 Magnetic field (2B)

1. Can be drawn when 2 B is combined. Same direction stronger, opposite is weaker. Stronger have more lines while weaker have less

2. It will show imbalance, a force that will move the wire in this case downward​

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Catapult field

Multiple Choice

When combining magnetic field, same direction will make the magnetic force

• Stronger

• Weaker

• Unchanged

Multiple Choice

When combining magnetic field, opposite direction will make the magnetic force

• Stronger

• Weaker

• Unchanged

Multiple Choice

When combining magnetic field, up and down direction will make the magnetic force

• Stronger

• Weaker

• Unchanged

Multiple Choice

When combining magnetic field, down and down direction will make the magnetic force

• Stronger

• Weaker

• Unchanged

Multiple Choice

When combining magnetic field, down and left direction will make the magnetic force

• Stronger

• Weaker

• Unchanged

Easy way to determine force (F), magnetic field (B) or current (I) direction without drawing catapult field

​Magnetic field points to south pole​

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Fleming Left Hand Rule (FBI)

Multiple Choice

Where the rod will move?

• Up

• Down

• Left

• Right

Multiple Choice

Where the rod will move?

• Up

• Down

• Left

• Right

Multiple Choice

Where the rod will move?

• Northwest

• Northeast

• Southwest

• Southeast

Multiple Choice

Two wires, both have current flowing upward. What is the force between the wires?

• Towards each other

• Away from each other

• Both move left

• Both move right

Factors affecting Force

Force can be increased by

1. Increasing current / Decreasing resistance

2. Increasing magnetic field no, strength

3. Loop the wire as a coil

4. Increase no of coil

More force make the rod moves faster

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