VCE Together Year 12 Physics: Interaction Between Fields

#### Physics

• How do things move without contact?
• How are fields used to move electrical energy?
• How fast can things go?
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• How are light and matter similar?
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# Interaction Between Fields

In this lesson on Interaction Between Fields, which is part of Unit 3 Area of Study 1 for VCE Physics, you will learn how to:

• describe the interaction of two fields, allowing that electric charges, magnetic poles and current carrying conductors can either attract or repel, whereas masses only attract each other.

### Interaction Between Two Parallel Current-Carrying Wires

The interaction between two parallel current-carrying wires is a magnetic interaction which depends on the following factors:

• Current and its direction
• The length of the wire
• How far apart they are
F = \frac{\mu_o I_1 I_2 L}{2 \pi R}    B = \frac{\mu_o I}{2 \pi R}

The force on a single wire:

F = BIL sin(\theta)

### Why does a moving charge generate a magnetic field?

This video will explain the answer to this question.

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