Two parallel wires, 4cm apart, carry currents of 2A and 4A respectively, In the same directions. The force per unit length in N/m of one wire on the other is:
Correct answer: D. 4 x 10^-5, atractive
- A. 1 x 10^-3 repulsive
- B. 4 x 10^-5, repulsive
- C. 1 x 10^-3 attractive
- D. 4 x 10^-5, atractive
Explanation
Force per unit length beween two current carrying straight wires=combining equations F = ILB and B = μ I/2(pi)r
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Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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