Phys 4, Section 2             Quiz 6                                     Feb 28, 2002

1. The magnitude of the B-field due to a moving charge is greatest when the angle
between L and r is
A) 0^o         B) 90^o             C) magnitude independent of angle

2. Which of the following can produce a region with a uniform B-field?
A) moving charge         B) straight wire carrying current         C) solenoid

3. If a current is passed through one of two closely spaced metal rods and the
other rod moves away, the other rod must have a current that is
A) parallel         B) anti-parallel                 C) zero

4. Which of the following is a term for magnetic flux?
A) BC L             B) BC A             C) both                 D) neither

5. Whose law relates a magnetic function to current?
A) Gauss’s law for magnetism
B) Ampere’s law for magnetism
C) Gauss’s law for electricity

6. If current flows clockwise as seen from above through a horizontal wire loop, the
magnetic field at the center of the loop is directed
A) up         B) down             C) no field at center of loop

7. The magnetic field B at a distance r from a long straight wire is measured. What
will the magnetic field B be at a point twice as far from the wire?
A) doubled         B) halved         C) quadrupled             D) quartered

8. Which of the following is true?
A) a closed surface determines a unique volume
B) a unique boundary determines a unique surface
C) both are true
D) neither are true

9. What is the pitch of a solenoid?
A) number of loops         B) length L of coil         C) ratio of number to length

10. Who came up with the idea of a displacement current?
A) Newton         B) Coulomb         C) Gauss         D) Maxwell         E) Ampere

Answers: 1-b, 2-c, 3-b, 4-b, 5-b, 6-b, 7-b, 8-a, 9-c, 10-d

Last modified on April 02, 2002