A straight wire aligned with the z axis carries an alternating current I=I_cos (2лft). In this case, the magnetic field around the wire at a radius r away from the wire is given by: 0 O a. O b. O C. μ B = sin (2лft) 9 2лr º 0 1 B = I cos (2лft) 9 2лr 0 O d. 1 B = I cos (2лft) r 2лr о 9 μ BI cos (2лft) 2лr

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Chapter1: Units, Trigonometry. And Vectors
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A straight wire aligned with the z axis carries an alternating current I = I cos (2πft). In this case, the magnetic field around the wire at a radius r away from the wire is given by:
O a.
O b.
O d.
B =
q
B =
Q
B =
r
μ
2πr 0
1
-I sin (2лft)
2πr 0
μ
I cos (2nft)
1
2πr 0
0
I cos (2лft)
BI cos (2лft)
9
2лr о
Transcribed Image Text:A straight wire aligned with the z axis carries an alternating current I = I cos (2πft). In this case, the magnetic field around the wire at a radius r away from the wire is given by: O a. O b. O d. B = q B = Q B = r μ 2πr 0 1 -I sin (2лft) 2πr 0 μ I cos (2nft) 1 2πr 0 0 I cos (2лft) BI cos (2лft) 9 2лr о
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