exam 3 new

1. 1Two parallel wires are near each other and carry currents that are in the same direction.
   Wire I carries current i, and wire II carries current 3i. Which statement about the
   magnetic forces that the two wires exert on each other is correct?

   

   1. AThe two wires exert no forces on each other.
   2. BThe two wires exert attractive forces of the same magnitude on each other.
   3. CThe two wires exert repulsive forces of the same magnitude on each other.
   4. DWire I exerts a stronger force on wire II than wire II exerts on wire I.
   5. EWire II exerts a stronger force on wire I than wire I exerts on wire II.
2. 2A long straight wire carries a current in the negative x direction. In which direction must
   an existing magnetic field point in order for the wire to have a chance to be suspended
   above the ground, that is, to balance the gravitational force? Suppose the gravitational
   force is in the negative y direction.

   

   1. A-y
   2. B+y
   3. C+x
   4. D+z (out of the page)
   5. E-z (into the page)
3. 3Two long straight wires each carry a current of 12 A. One wire lies on the x axis with its
   current in the negative x direction. The other wire lies on the y axis with its current in
   the positive y direction. In the xy plane, which quadrant (quadrants) has (have) points
   where the magnetic field is zero?
   

   

   1. AI
   2. BII
   3. CII and IV
   4. DI and III
   5. EII and III
4. 4A square loop of wire lies in the plane of the page and carries a current I as shown.
   There is uniform magnetic field B~ directed towards the top of the page, as indicated.
   The loop will tend to rotate:
   

   

   1. Aabout PQ with KL coming out of the page
   2. Babout PQ with KL going into the page
   3. Cabout RS with MK coming out of the page
   4. Dabout RS with MK going into the page
   5. Eabout an axis perpendicular to the page
5. 5The figure shows two closed paths wrapped around two conducting loops carrying currents i1 = 3.0 A and i2 = 5.0 A. What is the value of the integral H B~ · d~s (in T · m) for path 2?

   

   1. A1.2 × 10^−6
   2. B3.0 × 10^−7
   3. C−1.6 × 10^−5
   4. D−1.4 × 10^−5
   5. E−3.3 × 10^−6
6. 6A circular loop of wire with a radius of 30 cm lies in the xy plane and carries a current
   of 3 A, clockwise when viewed from a point on the positive z axis. Its magnetic dipole
   moment is

   1. A0.85 A · m2, in the positive z direction
   2. B0.85 A · m2, in the negative z direction
   3. C0.25 A · m2 , in the positive z direction
   4. D0.25 A · m2 , in the negative z direction
   5. E0.25 A · m2, in the xy plane
7. 7A long wire carries a current toward the east in a magnetic field that is directed due
   south. What is the direction of the magnetic force on the wire?
   

   1. AWest
   2. BNorth
   3. CEast
   4. DVertically upward
   5. Evertically downward
8. 8The figure shows a proton moving at velocity ~v = (−200 m/s)ˆj toward a long straight
   wire with current i = 350 mA. At the instant shown, the proton’s distance from the wire
   is d = 2.89 cm. What is the magnitude of the magnetic force on the proton due to the
   current?

   

   1. A2.25 × 10^−25 N
   2. B1.81 × 10^−21 N
   3. C4.00 × 10^−19 N
   4. D2.50 × 10^−22 N
   5. E7.75 × 10^−23 N
9. 9A particle, with charge q = +1.60 × 10−16 C and mass m = 3.20 × 10−27 kg, is traveling
   in the positive y direction at speed v = 5.00 × 106 m/s. It eneters a region of uniform
   magnetic field where it is deflected to follow a circular path of radius R = 0.500 m. What
   is the magnitude of the magnetic field in this region?
   

   1. A1.50 × 10−6 T
   2. B3.31 × 10−4 T
   3. C2.00 × 10−4 T
   4. D7.67 × 10−6 T
   5. E8.97 × 10−4 T
10. 10The magnitude of the magnetic field 50 cm from a long, thin, straight wire is 8.0 µT.
    What is the current through the long wire?

    1. A20 A
    2. B12 A
    3. C45 A
    4. D89 A
    5. E37 A

11. 11A flat, circular loop has a radius of 10.0 cm and the current through the wire is 0.50 A.
    Determine the magnitude of the magnetic field at the center of the loop.
    

    1. A1.00 × 10^−5 T
    2. B3.14 × 10^−6 T
    3. C2.11 × 10^−6 T
    4. D5.02 × 10^−5 T
    5. E4.13 × 10^−6 T
12. 12A solenoid has 12 turns per centimeter. What current will produce a magnetic field of
    2.0 × 10−2 T within the solenoid?

    1. A7.8 A
    2. B5.6 A
    3. C13 A
    4. D41 A
    5. E19 A
13. 13A proton traveling at 23.0◦ with respect to the direction of a magnetic field of strength 2.60 mT experiences a magnetic force of 6.50 × 10−17 N. What is the proton’s speed?

    1. A7.00 × 10^5 m/s
    2. B2.50 × 10^5 m/s
    3. C0.500 × 10^5 m/s
    4. D2.00 × 10^5 m/s
    5. E4.00 × 10^5 m/s
14. 14The figure shows four arrangements in which long parallel wires carry equal currents
    directly into or out of the page at the corners of identical squares. Which arrangement
    has the greatest magnitude of the net magnetic field at the center of the square?
    

    

    1. Aa
    2. Bb
    3. Cc
    4. Dd
15. 15The figure shows four identical currents i and five Amperian paths (a through e) encircling
    them. Which path has the most positive value of HB~ · d~s taken in the directionshown?
    

    

    1. Aa
    2. Bb
    3. Cc
    4. Dd
    5. Ee

Description

Quiz on exam 3 new, created by hank fournier on 31/07/2018.

Author

hank fournier

Language

English

Views

1

Rating

No ratings yet

Rate this quiz

Rate this quiz

More on Motor Effect and Electric Motors