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  • Two parallel, long wires carry currents i1 and i2 with i1> i2. When the currents are in the same direction, the magnetic field at a point midway between the wires is <img alt="30 \mu \mathrm{T}"

Two parallel, long wires carry currents i1 and i2 with i1> i2. When the currents are in the same direction, the magnetic field at a point midway between the wires is 30 \mu \mathrm{T} . If the direction of this is reversed, the field becomes  90 \mu \mathrm{T}  The ratio i  1 / \mathrm{i} 2  is

Option: 1

4


Option: 2

3


Option: 3

2


Option: 4

1


Answers (1)

best_answer

\mathrm{ i_1+i_2 \alpha 90 \\ }                  \mathrm{ \frac{i_1+i_2}{i_1-i_2}=3 }

\mathrm{ i_1-i_2 \alpha 90 }

\mathrm{ \Rightarrow \frac{i_1}{i_2}=2 \quad \Rightarrow \frac{i_1+i_2+i_1-i_2}{i_1-i_2-i_1-i_2}=\frac{3+1}{1-3} }

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manish

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