Physics practice test 4. You have a circular loop of wire in a uniform magnetic

Question

Physics practice test

4. You have a circular loop of wire in a uniform magnetic field, the loop is free to rotate around 4 an axis :done a diameter. the loop is rotating at a constant angular speed omega. If the loop is connected to a resistor. the current in the resistor a. is constant. h. fluctuates up and down. but is always in the same direction. c. fluctuates up and down. and alternates in direction. d. is zero (there is no current). 5. Which of the following TWO statements about a ferromagnetic material arc correct? a. If it is used to completely fill the space inside a coil, the field inside the coil will be weaker than it was before. b. If it is used to completely fill the space inside a coil. the field inside the coil will be stronger than it WCLS before. c. It can be used to make a permanent magnet (like a bar magnet). d. It cannot be used to make a permanent magnet.

Explanation / Answer

4)

B) fluctuates up and down but always in the same direction

5)

B) If it is used to completely fill the coil, the field will be stronger

C) It can be used to make a permanent magnet

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