a) According to the right-hand rule, the direction of the magnetic fields of the 3 wires are shown:
We find the magnetic fields B1, B2 and B3:
퐵1=퐵2= 푢0 푖 = 푢0 푖 = 4∗3.14×10−7 ∗(3.65) =ퟒퟐ.ퟔퟔퟎ풖푻 2휋푟 2휋( 2푎) 2 ∗ 3.14 ∗( 2(0.0121))
퐵3= 푢0 푖 = 푢0 푖 = 4∗3.14×10−7 ∗(3.65) =ퟐퟎ.ퟏퟏퟎ풖푻 2휋푟 2휋(3푎) 2 ∗ 3.14 ∗(3∗(0.0121))
The x components of the B1 and B2 cancel each other; therefore the net magnetic field will be downward and we have (the negative sign is because the direction is downward):
퐵=− 퐵1cos 45 +…
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Figure 1: Tesla coil (diagram)
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AC Conductivity and Resistivity
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ac =1/ρac (6)
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