A square loop of wire carries a current I. Current is flowing in a counterclockw
ID: 1314255 • Letter: A
Question
A square loop of wire carries a current I. Current is flowing in a counterclockwise direction as shown.
1) What is the direction of the magnetic field at A?
Into the page
Out of the page
The field is zero
2) What is the direction of the magnetic field at B?
Into the page
Out of the page
The field is zero
3) What happens to the magnitude of the magnetic field as you move away from the loop?
decreases
increases
stays the same
4) If this loop is placed in a uniform magnetic field pointing into the page, what is the direction of the net force on the loop?
up
down
left
right
zero
5) Now the loop is placed near a horizontal wire with current moving to the right. If the horizontal wire is right below the loop (in the plane of the page), what is the direction of the net force on the loop?
up
down
left
right
zero
6) If the current in the square loop and horizontal wire are both 2 A, the square loop has side lengths of 10 cm each, and the horizontal wire is 5 cm from the bottom side of the square loop, what is the magnitude of the net force on the loop?
1.07x10-6 N
2.34x10-6 N
3.71x10-6 N
4.98x10-6 N
6.11x10-6 N
The next eight questions are about the following situation:
Three particles enter a region of constant magnetic field into the page (B = 0.5 T)
7) If the particles all move at the same speed v and have the same charge q, which particle has the largest mass?
#1
#2
#3
8) If the particles all move at the same speed v and have the same mass m, which particle has the largest charge?
#1
#2
#3
9) If the particles all have the same charge q and same mass m, which particle has the largest velocity?
#1
#2
#3
10) Assume the magnitude of the charge of particle #1 is 100 mC, its mass is 0.03 g and its velocity is 2000 m/s. What is the magnetic force on particle #1?
0.1 N
0.2 N
0.3 N
0.4 N
0.5 N
11) What is the acceleration of particle #1?
1111 m/s2
2222 m/s2
3333 m/s2
4444 m/s2
5555 m/s2
12) What is its radius of curvature of particle #1 in the magnetic field?
345 m
697 m
1200 m
1650 m
1983 m
13) A uniform electric field is now applied in the region of the magnetic field so that particle #1 continues to move up vertically without bending. What should be the direction of this electric field?
right
left
up
down
into the page
out of the page
14) What should be the magnitude of this electric field?
600 N/C
700 N/C
800 N/C
900 N/C
1000 N/C
15) A square loop is enclosed by a long solenoid with a current flowing as shown by the arrow. Which configuration will give the largest magnetic flux through the square loop?
a
b
c
d
e
Explanation / Answer
1. Out of the page.
2. Into the page.
3. decreases.
4. zero.
5. Down.
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