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The magnetic field at a point midway between two parallel long wires carrying currents in the same direction is 10 \mu \mathrm{T}. If the direction of the smaller current among them is reversed, the field becomes 30 \mu \mathrm{T} The ratio of the larger to the smaller current in them is:

Option: 1

3:1


Option: 2

2:1


Option: 3

4:1


Option: 4

3:2


Answers (1)

best_answer

 B1 - B2 = 10 
 B1 + B2 = 30
 

Posted by

Rishi

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