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Lubov Fominskaja [6]
3 years ago
15

Two long, straight, parallel wires 7.2 cm apart carry currents of equal magnitude I. They repel each other with a force per unit

length of 4.2 nN/m. Find the current I.
Physics
1 answer:
Bogdan [553]3 years ago
5 0

Answer:

current I = 38 mA

Explanation:

given data

distance r = 7.2 cm

repel each other force per unit length \frac{F}{l} = 4.2 nN/m

solution

we know 2  wire is parallel and when current flow through these wire they exert force each other due to magnetic field

and current I(1) = I(2)   ................1

so

\frac{F}{l} = \frac{\mu _o}{2\pi } \times \frac{I(1) \times I(2)}{r}     ..................2

put here value

4.2 × 10^{-9} = \frac{4\pi \times 10^{-7}}{2\pi } \times \frac{I^2}{7.2\times 10^{-2}}    

solve it we get

I = 0.038884 A

current I = 38 mA

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