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Moving Charges and Magnetism — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism2 Marks
Question
Define the international definition of ampere.
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Answer

Definition of ampere : Magnetic force acting between two long, straight and parallel current carrying conductors per unit length,
If $i_1=i_2=1 A$ and $d=1 m$, then
$\frac{\delta F }{\delta l}=\frac{\mu_{ o } i_1 i_2}{2 \pi d}$
$\frac{\delta F }{\delta l}=\frac{\mu_0(1 A)(1 A)}{2 \pi(1 m)}=\frac{4 \pi \times 10^{-7}}{2 \pi}$
$\frac{\delta F }{\delta l}=2 \times 10^{-7} N / m$
1 ampere electric current is that electric current which produces a force of $2 \times 10^{-7} N / m$ on two straight, parallel, current carrying wires when it flows through them and the wires are kept at a distance of 1 m in air or vacuum on the length 1 m of the wire.

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