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Two parallel, long wires carry current `i_(1)` and `i_(2)` with`i_(1)gti_(2)`. When the currents are in the same direction, the magnetic field at a point midway between the wires is `30 muT`. If the direction of `i_(1)` is reversed , the field becomes `90muT`. The ratio `i_(1)//i_(2)` is

A

4

B

3

C

2

D

1

Text Solution

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The correct Answer is:
C
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MOTION-MAGNETISM -EXERCISE-1
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  5. Two very long straight parallel wires, parallel to y-axis, carry curre...

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  6. If the ratio of magnetic fields at two point in a definite direction d...

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  7. Two parallel straight long conducting wires, which are placed at a dis...

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  11. Infinite number of straight wires each carrying current I are equally ...

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  17. Axis of a solid cylinder of infinite length and radius R lies along y-...

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  18. The dimensional formula for the physical quantity (E^(2)mu(0)epsilon(0...

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  20. Find the magnetic induction at the origin in the figure shown.

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