Right-hand rule for straight conductors: Thumb → current, fingers → curl in the direction of the magnetic field.
Right-hand rule for loops: Thumb → magnetic field. Fingers → curl in the direction of the current.
The induced current creates an induced magnetic field that opposes the change in magnetic flux inducing it.
The field due to the wire carrying a current in loop C is out of the page. The change in flux is increasing.
The induced field is into the page to oppose the increasing flux.
Two closed loops A and C are close to a straight wire carrying a current I.
(a) Find the direction (clockwise or counterclockwise) of the current induced in the loop C if I is steadily increasing
a. The current in loop C is counterclockwise
b. The current in loop C is clockwise
c. The current in loop C is zero
(b) While I is increasing, what is the direction of the net force that the wire exerts on loop C?
a. The wire exerts an upward force on loop C
b. The wire exerts a downward force on loop C
c. The wire exerts no force on loop C
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Lenz's Law concept. You can view video lessons to learn Lenz's Law. Or if you need more Lenz's Law practice, you can also practice Lenz's Law practice problems.