Two infinitely long parallel wires are at a distance of 1 meter. Both of them carry 2 Ampere of current. The force of attraction per unit length between the two wires is found to be k 107 N / m . Findk?
Answers
Force per unit length between two infinity long parallel wires is given by,
where, is permeability of vaccum or air, are current through parallel wires respectively and d is the separation between wires.
here, = 4π × 10^-7 Nm/A²
and d = 1m
so, = 4π × 10^-7 × (2)²/(2π × 1)
= 2 × 10^-7 × 4
= 8 × 10^-7 N/m
but given, force per unit length is k × 10^-7 N/m
comparing both sides,
we get, k = 8
Answer: I
Explanation:
Force per unit length between two infinity long parallel wires is given by,
where, is permeability of vaccum or air, are current through parallel wires respectively and d is the separation between wires.
here, = 4π × 10^-7 Nm/A²
and d = 1m
so, = 4π × 10^-7 × (2)²/(2π × 1)
= 2 × 10^-7 × 4
= 8 × 10^-7 N/m
but given, force per unit length is k × 10^-7 N/m
comparing both sides,
we get, k = 8
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