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4. Moving charges and magnetism — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics4. Moving charges and magnetism1 Mark
MCQ
Two long straight parallel wires, carrying (adjustable) current $I_1$ and $I_2$, are kept at a distance $d$ apart. If the force $'F'$ between the two wires is taken as 'positive' when the wires repel each other and 'negative' when the wires attract each other, the graph showing the dependence of $'F'$, on the product $I_1 I_2$, would be
  • ✓

  • B

  • C

  • D

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Answer

Correct option: A.

a
$I_1\, I_2\, =$ Positive

(attract) $F\, =$ Negative

$I_1\, I_2\, =$ Negative 

(repell) $F\, =$ Positive  

Hence, option $(a)$ is the correct answer

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