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Lecture 29b

# Lecture 29b - Ch 29(contd Magnetic Fields due to currents...

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Ch 29 (contd.) Magnetic Fields due to currents Magnetic field around a long, straight current- carrying wire

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2 Interaction between two current carrying wires i i The two wires may exert forces on each other through Magnetic Interactions. 1. Think of the Red Wire as creating a B-field . 2. Then think of that B-field creating a force on the moving charges (current) in the Blue Wire .
3 i i What is the direction of the Force acting on the Blue Wire ? A)Up B)Right C)Left D)Into the Page E)Out of the Page B L i F

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4 i 1 i 2 What is the magnitude of the force exerted on the blue wire? R i L i LB i F 2 | | 1 0 2 1 2 21 Force on the Blue Wire from the red wire is R i B 2 | | 1 0 1 R The red wire produces magnetic field B 1 at the location of the blue wire B L i F
5 i i What is the direction of the Force acting on the Red Wire ? A)Up B)Right C)Left D)Into the Page E)Out of the Page B L i F

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6 i i We have seen that wires with parallel currents attract each other. i A. The wires still attract each other B. The wires repel each other C. The wires exert no force on each other i What happens if we flip the direction of one current?
How does a rail gun work?

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