Need help - Magnetic field question

  • Thread starter colombo
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The magnetic field midway between two long straight parallel vertical conductors (due to the current flowing through them)is twice the strength of the field due to only one wire at the same point how far to the right of the right most wire will the strength of the field be 1/10 of the strength of the field due to only one wire measured at the midpoint of the two wires. The distance between the two wires is L

A. 1.12L
B. 1.79L
C. 2.38L
D. 2.73L
E. none of the above

please any one help me to get this answer, im really tring to two days to get the solution , i got 2.38L but, i think im getting wrong that bcoz, i have did the online quiz, i got wrogn this again, please any one check and tell me
 

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