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The magnetic field at a point midway bet...

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

A

a) `3:1`

B

b) `2:1`

C

c) `4:1`

D

d) `3:2`

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NEW JOYTHI PUBLICATION-MOVING CHARGES AND MAGNETISM-COMPETITIVE EXAM CORNER
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