Qstnid -7- Two Long And Parallel Straight Wires A And B Carrying Currents Of 8.0 A And 5.0 A In The Same Direction Are Separated By A Distance Of 4.0 Cm. Estimate The Force On A 10 Cm Section Of Wire A. - 04: Moving Charges And Magnetism - Neet-xii-physics

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NEET-XII-Physics

04: Moving Charges And Magnetism

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#7
Two long and parallel straight wires A and B carrying currents of 8.0 A and 5.0 A in the same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A.

Ans : Current flowing in wire A, I_A = 8.0 A

Current flowing in wire B, I_B = 5.0 A

Distance between the two wires, r = 4.0 cm = 0.04 m

Length of a section of wire A, l = 10 cm = 0.1 m

Force exerted on length l due to the magnetic field is given as:

Where,

= Permeability of free space = 4``\pi`` × 10^-7 T m A^-1

The magnitude of force is 2 × 10^-5 N. This is an attractive force normal to A towards B because the direction of the currents in the wires is the same.