A copper loop hangs from two strings, as shown. In which direction (toward or away from the magnet) does the loop swing if the magneta. Is stationary?b. Is moving toward the loop?c. Is moving away from the loop?

a.) a current in the CW direction to enhance the decreasing north magnetic field. b.) a current in the CW direction to enhance the decreasing south magnetic field. c.) a current in the CW direction to oppose the increasing south magnetic field. d.) a current in the CW direction to oppose the increasing north magnetic field. e.) no current in the coil. 7.) A conducting coil is rotated at constant speed in a uniform magnetic field as shown in the figure here. The time required by the loop to make a full rotation is T. The current generated in the coil would increase Side view a.) if the angular speed of the coil increases. b.) if the area of the coil increases. c.) if the strength of the magnetic field increases. d.) All of the above are correct. e.) None of the above are correct. 8.) An RLC circuit has a resonant frequency of fo. When the circuit is driven by an AC voltag source whose frequency is 2fo, which of the following is the most accurate?

A negatively charged particle is moving with a constant velocity directed to the left through a region of a uniform magnetic field B directed into the page as shown in the figure, in which direction must an electric field be applied to keep the particle moving along a straight line? XB Select one: a.Upward b.Downward c.into the page d.To the leftin the plane of the page e.Out of the page 1.To the right in the plane of the page

If number of turns (N), area (A) and magnetic field (B) have same value for a square and circular loop, but current of square loop is double the current in the circular loop then maximum torque produced in the square loop will be 21 a. Double the torque in circular loop O b. Half of torque in circular loop O c. 4 times the torque in circular loop O d. Equal the torque in circular loop

A stationary magnet with north pole at the bottom lies at the centre of the circular coil. Determine the direction of induced current (when viewed from above) in the coil. a. no current in the coil b. a current whose direction cannot be determined from the information given c. a clockwise current in the coil d. a counterclockwise current in the coil

What is the direction of the magnetic force on a negative charge that moves as shown in the figure? B Select one: O a. In O b. there is no magnetic force O. Out O d. Left When the light is passing from rarer to a denser medium, which is the correct statement? O a. speed becomes zero O b. speed of light increases speed of light remains constant O d. speed of light decreases

Which of the following can be done to make a stronger solenoid (an electromagnet)? Select one or more: a. increase the supplied voltage b. decrease the current c. decrease the number of loops d. decrease the length of the solenoid

A positively-charged point particle, q, with a speed of v = 3.0 x 105 m/s enters a uniform magnetic field, , at a 300 angle to the field as shown in the diagram below. Which of the following paths best describes the trajectory of the particle?     a. A circle   b. A helix   c. An ellipse   d. A hyperbola   e. A parabola

What will happen to the wire between the magnet poles when the switch S is close? V B switch Q Select one: a. Nothing. The wire remains in place O b Moves to the magnet's South pole O c Moves out of the screen (or page) C. d. Moves into the screen (or page) e. Moves to the magnet's North pole

Which of the following changes would increase the magnetic field strength at the center of the solenoid, assuming everything else remains constant? Explain why?   A.Decreasing the length of the solenoid by removing turns of wire while keeping ? constant B.Decreasing ?,the current in the wire C.Decreasing ?,the number of turns of wire per millimetre D.Increasing ?,the current in the wire E.Increasing the length of the solenoid by adding turns of wire while keeping ? constant