Two long parallel wires x and y carrying a current of 3A and 5A respectively. The force per unit length experienced by x is 5 x 10^-5N to the right, the force per unit length experienced by wire y is:
Correct answer: D. 5 x 10^-5N to the left
- A. 2 x 10^-5N to the left
- B. 3 x 10^-5N to the right
- C. 5 x 10^-5N to the right
- D. 5 x 10^-5N to the left
Explanation
Two parallel current carrying wires experience equal, but opposite magnetic force. 'Parallel' indicates that the current is flowing in the same direction which causes them to experience a repulsive force as their magnetic fields move in opposite directions at their closest point (this can be proven using the right hand grip rule).
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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