Two parallel wires each carry current I in the directions as shown. Which of the

Question

Two parallel wires each carry current I in the directions as shown. Which of the following is a true statement? A) The two wires are attracted to each other. B) The two wires are unaffected by each other. C) The magnetic fields generated by the currents cancel everywhere surrounding the two wires. D) The two wires repel each other. E) The net magnetic field due to the two wires is uniform everywhere. A conducting loop is formed by running a wire completely around the edge of this page. A uniform magnetic field directed into the page is increasing at the rate of 2.5 T/s. What is the direction of the current induced in the loop? A) The induced current will move counterclockwise around the edge of the page. B) The induced current will alternate between clockwise and counterclockwise. C) The induced current will move clockwise around the edge of the page. D) No current will be induced because the loop d field do not have the right orientation. What is Michael Faraday no

Explanation / Answer

Two parallel current carrying wires, where both have current going in same direction always attract each other,

This can be analysed by implementing fleming right hand rule. Where index finger points to the direction of current, middle finger points to direction of magnetic field and thumb points towards the direction of generated force.

For this case, thumb points downward for upper wire while thumb points upwards for lower wire, thus we deduce they attract.

If we divide the region in 3 sub section ( 1 above upper wire, 2 between the 2 wires , 3 below the two wires )

From Right hand thumb rule we can say, that the field produced by the two wires, will be such that the resultant field is

region 1. both wires produce field going into the page

region 2. upper wire produces field which comes out of the page, while lower wire produces field which goes into the page. hence at the midpoint between the 2 wires net field is zero ( as both carry equal magnitude of current)

region 3. both wire produces field which is coming out of the page, hence resultant field is simply the vector sum.

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