A straight vertical conductor carries a current. At a point 5cm due north of it, the magnetic induction is found to be 20T due east. The magnitude of magnetic induction at a point 10cm east of it will be_____
40T
5T
10T
20T
A
20T
B
5T
C
40T
D
10T
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Solution
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Bα1r B1B2=r2r1 B2=20×510 =10T
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