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प्रश्न
Calculate force per unit length acting on the wire B due to the current flowing in the wire A.(See
Figure 2 below)
उत्तर
`F/l = mu_0/(4pi) (2I_1I_2)/r`
`10^(-7) xx (2xx20xx25xx75)/0.01`
= 0.03 N/m
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