Lenz's Law and Current's Direction

AI Thread Summary
The discussion focuses on applying Lenz's Law to determine the direction of induced current in a loop situated in the xy plane, with the z-axis indicating the direction of changing magnetic flux. The magnetic flux is increasing in the -z direction, leading to an induced current that opposes this change. According to Lenz's Law, the induced current will flow counter-clockwise, which corresponds to the +z direction. The correct interpretation confirms that the resultant induced current aligns with this understanding. The conclusion emphasizes the importance of Lenz's Law in predicting current direction based on changes in magnetic flux.
Soaring Crane
Messages
461
Reaction score
0

Homework Statement



A loop rests in the xy plane. The z axis is normal to the plane and positive upward. The direction of the changing flux is indicated by the arrow on the z axis. The diagram that correctly shows the direction of the resultant induced current in the loop is

tip30.gif


a. (1)
b. (2)
c. (3)
d. (4)
e. (5)


Homework Equations



emf = - [d(magnetic flux)]/dt

The Attempt at a Solution



In Figure 4, the magnetic flux is increasing in the -z-direction. From Lenz's Law, there is an opposition to this change, so the induced current will be counter-clockwise, which corresponds to the +z-direction?

Thanks.
 
Physics news on Phys.org
Exactly right.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Figure 1 Overall Structure Diagram Figure 2: Top view of the piston when it is cylindrical A circular opening is created at a height of 5 meters above the water surface. Inside this opening is a sleeve-type piston with a cross-sectional area of 1 square meter. The piston is pulled to the right at a constant speed. The pulling force is（Figure 2）： F = ρshg = 1000 × 1 × 5 × 10 = 50,000 N. Figure 3: Modifying the structure to incorporate a fixed internal piston When I modify the piston...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Induced current and force on circular loop in varying magnetic field
Replies
4
Views
983
How does an eddy current brake work exactly?
Replies
2
Views
2K
Direction and magnitude of electric field produced by current change
Replies
8
Views
998
What is the direction of the current in the given image?
Replies
18
Views
3K
EMF shielding using a conductor
Replies
6
Views
2K
Eddy currents in Faraday's Law Experiment
Replies
3
Views
2K
Origin of repulsive force on a magnet approaching conducting ring?
Replies
5
Views
1K
How Does Lenz's Law Explain the Jumping Ring Phenomenon?
Replies
8
Views
2K
Induced Current Direction in a Changing Magnetic Field
Replies
1
Views
2K
Motional EMF in the presence of a time-varying magnetic field
Replies
11
Views
3K

Hot Threads

Recent Insights

Back
Top