Lenz's Law Practice

Quiz
•
Physics
•
12th Grade
•
Medium
Paige Jester
Used 74+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The bar magnetic is at rest next to the loop. What direction is the induced current in the wire?
Clockwise
Counter Clockwise
I = 0
Answer explanation
1. Existing field goes right.
2. Flux is constant.
3. Constant flux means no current!
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The loop is being pulled to the right out of the magnetic field. What direction is the induced current in the wire?
Clockwise
Counter Clockwise
I = 0
Answer explanation
1. Existing flux points out of the page.
2. Flux is DECREASING.
3. New flux must oppose this decrease and point out of page.
4. Using RHR #1, for B in loop to point out of page, current is CCW.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The bar magnet is moving down towards the loop from above the page. What direction is the induced current in the wire?
Clockwise
Counter Clockwise
I = 0
Answer explanation
1. Existing flux points out of page (towards south pole).
2. Flux is INCREASING out of the page as magnet gets closer.
3. New flux must oppose this and point INTO the page.
4. Using RHR #1, to have field pointing into page in loop center, current is CW.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The loop shrinks in a constant magnetic field. What direction is the induced current in the wire?
Clockwise
Counter Clockwise
I = 0
Answer explanation
1. Existing flux points out of the page.
2. Flux is DECREASING as area decreases.
3. New flux must oppose this and point out of page.
4. Using RHR #1, for B in loop to point out of page, current is CCW.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The magnet is moving towards the loop from below the page. What direction is the induced current in the wire?
Clockwise
Counter Clockwise
I = 0
Answer explanation
1. Existing flux points out of the page (away from north pole).
2. Flux is INCREASING as magnet moves closer.
3. New flux must oppose this and point INTO the page.
4. Using RHR #1, for B in loop to point into page, current is CW.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The loop is expanding in a constant B-field. What direction is the induced current in the wire?
Clockwise
Counter Clockwise
I = 0
Answer explanation
1. Existing flux points into the page.
2. Flux is INCREASING as area increases.
3. New flux must oppose this and point out of page.
4. Using RHR #1, for B in loop to point out of page, current is CCW.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A loop of wire (seen from the edge) is rotated away from a perpendicular B-field. What direction is the induced current in the wire ASSUMING we are looking from the left side?
Clockwise
Counter Clockwise
I = 0
Answer explanation
1. Existing flux points left
2. Flux is DECREASING as the amount of area perpendicular to the field decreases.
3. New flux must oppose this and point left.
4. Using RHR #1, for B in loop to point left, current is CCW when looking from the left side towards the loop.
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