Describe the motion of the current earning rectangular loop below. You wish to d

Question

Describe the motion of the current earning rectangular loop below. You wish to design a device to separate positive charges approaching from the right in the following way: a. positive charges traveling faster than v=E/B are deflected out of the page b. positive charges traveling slower than v=E/B are deflected into the page c. positive charges travelling with v=E/B travel through undeflected A. Draw and label a configuration of magnetic and electric fields for your device. B. Explain the motion of positive charges as they move through your device from right to left. C. The device you designed is called a "velocity selector". Explain how you are able to select the velocity.

Explanation / Answer

Question 8:

Initially, the coil ABCD is in the horizontal position. The coil ABCD is being rotated in the anticlockwise direction between the poles N and S of a horseshoe type magnet.

As the coil rotates in the anticlockwise direction, the side AB and side CD of the coil moves down cutting the magnetic lines of force near the N-Pole of the magnet and moves up cutting the line of force near S-pole of the magnet respectively. Due to this, induced current is produced in the sides AB and DC of the coil. On applying Fleming’s right hand rule to the side AB and DC of the coil, we find that the currents are in the direction B to A and D to C respectively. The induced currents in the two sides of the coil are in the same direction, and we get an effective induced current in the direction BADC.

After half revolution, the side AB will come on the right hand side and DC will come on the left side. So, after half revolution, side AB starts moving up and side DC starts coming down. As a result of this, the direction of induced current in each side of the coil is reversed after half a revolution. Since the direction of induced current in the coil is reversed after half revolution so the polarity (positively and negative) of the two ends of the coil also changes after half revolution. The end of the coil which was positive in the first half of rotation becomes negative in the second half and vice versa. Thus, in one revolution of the coil, the current changes its direction 2 times.

After every half revolution, each side of the coil starts moving in the opposite direction in the magnetic field. The side of the coil which was initially moving downwards in a magnetic field, after half revolution, it starts moving in opposite direction – upwards. Similarly the side of the coil which was initially moving upwards, after half revolution, it starts downwards. Due to the change in the direction of the motion of the two sides of the coil in the magnetic field after every half revolution, the direction of current produced in them also changes after every half revolution.

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