A circular loop of wire has its radius doubled in time t. A uniform magnetic field is at an angle of 60 to the plane of the coil, and the magnetic field halves its intensity in the same time interval t. During this interval, what happens to the flux through the coil?
a. It decreases.
b. It remains the same.
c. It increases.
d. More information is needed to make this conclusion.
[Ques. 2] A mass-spring system on a horizontal frictionless surface is set in simple harmonic motion with amplitude A. The mass is then doubled and the system is again set into simple harmonic motion with the same amplitude. Which of the following is true about the total mechanical energy of the system due to doubling the mass?
a. It has doubled. c. It has halved. b. It has quadrupled. d. It has not changed.
[Ques. 3] Magnetism had been a known phenomenon for some time before its relation to electric currents was found. That a current in a wire produces a magnetic field was discovered by:
a. Ampere.
c. rsted. b. Maxwell.
d. Tesla.
[Ques. 4] When an object is moving in simple harmonic motion, which of the following is at a minimum when the displacement from equilibrium is zero?
a. the magnitude of the velocity
c. the kinetic energy
b. the magnitude of the acceleration
d. the total mechanical energy
[Ques. 5] A charged particle moving perpendicular to a magnetic field has a magnet force on it. But when an observer moves with the particle, so that the particle has a relative velocity of zero with respect to the observer, one would expect there would be no magnetic force. Yet there is still a force. If it is not a magnetic force, then what is the source of this force?
a. It is an electrical force.
b. It is due to the ether.
c. It is a gravitational force.
d. It is something other than any of the above.
[Ques. 6] A simple pendulum has a mass of 0.50 kg and a length of 1.0 m. It is displaced through an angle of 30 and then released. After a time, the maximum angle of swing is only 10. How much energy has been lost to friction?
a. 2.0 J
c. 0.66 J
b. 1.6 J
d. 0.58 J
[Ques. 7] Magnetic blood flow meters function using which of the following?
a. magnetic relays
c. a Hall-effect type arrangement
b. magnetic bacteria
d. radioactive decay
[Ques. 8] A simple pendulum of length 2.00 m has a mass of 100 g attached. It is drawn back 30.0 and then released. What is the maximum speed of the mass?
a. 1.14 m/s
c. 2.29 m/s
b. 4.58 m/s
d. 1.62 m/s
[Ques. 9] Which of the following devices makes use of an electromagnet?
a. relay
c. both A and B
b. motor
d. None of the above.
[Ques. 10] The kinetic energy of the bob on a simple pendulum swinging in simple harmonic motion has its maximum value when the displacement from equilibrium is at what point in its swing?
a. zero displacement
c. 1/2 the amplitude
b. 1/4 the amplitude
d. equal the amplitude
Quick Reply
