SATHEE: Moving Charges and Magnetism

Moving Charges and Magnetism - Result Question 71

72. Two long parallel wires are at a distance of 1 metre. Both of them carry one ampere of current. The force of attraction per unit length between the two wires is

(a) $2 \times 10^{- 7} N / m$

(b) $2 \times 10^{- 8} N / m$

(d) $10^{- 7} N / m$

[1998]

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Answer:

Correct Answer: 72. (a)

Solution:

(a) $F = \frac{μ_{0}}{4 π} \times \frac{2 i_{1} i_{2} l}{r} = 10^{- 7} \times \frac{2 \times 1 \times 1 \times 1}{1}$

$= 2 \times 10^{- 7} N / m$ .

[This relates to the definition of ampere]

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Moving Charges and Magnetism - Result Question 71

72. Two long parallel wires are at a distance of 1 metre. Both of them carry one ampere of current. The force of attraction per unit length between the two wires is

Answer:

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