Question 140: Magnetism and Matter

Question

Two parallel, long wires are kept 0.20 m apart in vacuum, each carrying current of x A in the same direction. If the force of attraction per meter of each wire is 2 $$	imes$$ 10$$-$$6 N, then the value of x is approximately :

Accepted Answer

$${{dF} \over {dl}} = 2 	imes {10^{ - 6}}$$ N/m $$ = {{{\mu _0}{i_1}{i_2}} \over {2\pi d}}$$
$$2 	imes {10^{ - 6}} = {{2 	imes {{10}^{ - 7}} 	imes {x^2}} \over {0.2}}$$
$$x = \sqrt 2  \simeq 1.4$$

Answer

1

Answer

2.4

Answer

1.4

Answer

2

Magnetism and Matter

Two parallel, long wires are kept 0.20 m apart in vacuum, each carrying current of x A in the same direction. If the force of attraction per meter of each wire is 2 $\times 10-$6 N, then the value of x is approximately :

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