Are these correct? I am confused on 2 and 3, but please check the others! Thank

Question

Are these correct? I am confused on 2 and 3, but please check the others! Thank you!! AP Physics 2 Honors Chapter 22 Electromagnetic Induction Ouiz MULTIPLE CHOICE: Write the letter of the BEST answer to the following questions in the space provided. (2 points each. of the the induced being generated in the figure. Su that the length rod is reduced by ppose what should factor of four. For the induced emfto be the same, A) Increase the magnetic field by a factor of two and decrease the speed of the rod by a factor of two. B) Decrease the magnetic field by a factor of two and increase the speed of the rod by a factor of two, OIncrease both the magnetic field and the speed of the rod by a factor oftwo. D) Decrease both the magnetic field and the speed of the rod by a factor of two. 2) Eddy currents are electric currents that can arise in a piece of metal when it moves through a region where the Metal sheet magnetic field is not the same everywhere. The drawing shows, for example, a metal sheet moving to the right at a velocity, i, and a magnetic field. B, that is directed perpendicular to the sheet. At the instant represented, the field only extends over the left half of the sheet. An emf is induced that leads to the eddy current indicated. Such eddy currents cause the velocity of the moving sheet to change. Does the eddy current cause the velocity to increase or decrease and does the eddy current circulate clockwise or A) Increase velocity with eddy current circulating clockwise. Decrease velocity with eddy current circulating clockwise. C) Increase velocity with eddy cument circulating counterclockwise. D) Decrease velocity with eddy current circulating counterclockwise. looking down at it. An external magnetic field has 3) A circular loop of wire is lying flat on a horizontal table, and you are a constant direction that is perpendicular to the table, and there is an induced current in the loop that circulates clockwise. Isthe extemal magnetic field directed upward toward you or downward away from you, and is its magnitude increasing or decreasing? A) Upward magnetic field that is increasing Downward magnetic field that is increasing. C) Upward magnetic field that is decreasing. D) Downward magnetic field that is decreasing. 4) When the switch in the drawing is closed, the current in the coil increases to its equilibrium value. While the current is increasing there is an induced current in the metal ring. The ring is free to move. What happens to the A) The ring jumps downward. B) The ring does not move. The ring jumps upward. E 5A transformer changes the 120-v emf at a wall socket up to 12,000 volts. What happens to the current and power? A) The current and power both increase by a factor of 100. B) The current increases by a factor of 100, but the power remains constant. C) The current remains constant, but the power increases by a factor of 100. D) The current remains constant, but the power decreases by a factor of 100. The current decreases by a factor of 100, but the power remains constant. The current and power both decrease by a factor of 100.

Explanation / Answer

your answer to question no. 2 is correct and your ans to question no. 3 is also correct.:

explanation:Only the right-hand side of the current loop is in the field, so that there is an unopposed force on it to the left (right hand rule). When the sheet is completely inside the field, there is no eddy current if the field is uniform, since the flux remains constant in this region. But when the plate leaves the field on the right, flux decreases, causing an eddy current in the clockwise direction that, again, experiences a force to the left, further slowing the motion. ans : 3 Downward magnetic field that is increasing.

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