1. The force experienced by a current carrying conductor in a magnetic field is maximized when the angle between the conductor and the magnetic field is
A. 0 degrees B. 45 degrees C. 90 degrees D. 180 degrees
2. If an electron is moving in the positive x-direction, at right angles to a magnetic field, experiences a magnetic force in the positive Y-direction. What is the direction of magnetic field? A. Positive Z-direction B. Negative Z-direction C. Negative Y-direction D. Negative X-direction.
3. A proton moving at a speed of 5x10^6 m/s enters a magnetic field of 0.4T pointing to the right. If the proton makes an angle of 30^0 with the field, find the magnitude of force on the proton?
A. 1.6x 10^(-13) N B. 1.0 x 10^(-13) N C. 3.2 x 10^(-13) N D. 1.6x 10^(-19) N
4. Which one of the following is not true about the magnet?
A. The attraction power of a magnet is greatest at the poles of the magnet.
B. Magnetic poles always exist in pairs.
C. when a magnet is cut into two pieces, the pieces will have been separated
to North Pole and South Pole.
D. The magnetic force between two magnets is greater when the distance b/n
them is smaller.
5. Magnets lose their properties if
heated, B . hammered, C. dropped from some height. D all
5. Which of the following magnet shapes is most commonly used in electric motors and generators?
A. Rectangular B. Circular C. Horseshoe D. Cylindrical
7. . Which of the following magnet shapes is commonly used in magnetic resonance imaging (MRI) machines?
A. Bar magnet B. Disc magnet C. Cylindrical magnet D. Spherical magnet
8. . Which of the following materials is most likely to be attracted to a magnet?
A. Aluminum B. Copper C. Iron C. Plastic.
9. Which of the following best explains why magnets have a north and south pole?
The arrangement of atoms in the magnet B. The shape of the magnet C. the magnetic domains with in the magnet D. the external magnetic field around the magnet.
A wire 0.50 m long carrying a current of 8.0 A is at right angles to a uniform magnetic field. 10. The force on the wire is 0.40 N. What is the strength of the magnetic field?
A. 0.1T B. 1T C. 0.2 T D. 2T