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Magnetics question

2004 · Shift 0 · Q145

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JEE Main
Physics
Magnetics
2004 · Shift 0 · Q145

Magnetics question

2004 · Shift 0 · Q145

JEE MainPhysicsMagneticsMCQ+4 / −1

Two long conductors, separated by a distance

d

carry current

{I_1}

and

{I_2}

in the same direction. They exert a force

F

on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to

3d

. The new value of the force between them is

A
$- {{2F} \over 3}$
B
${F \over 3}$
C
$-2F$
D
$- {F \over 3}$

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