Lenz's Law

The video tutorial explains Lenz's Law and its application in determining the direction of induced current in a loop due to changing magnetic flux. It covers the use of the right-hand rule and provides multiple examples to illustrate how changes in magnetic field, loop orientation, and magnetic flux affect the direction of induced current. The tutorial also clarifies common misconceptions about magnetic flux as a scalar quantity and the role of induced magnetic fields.

What is the primary purpose of Lenz's Law in electromagnetic induction?

• To determine the magnitude of induced EMF

• To measure the strength of a magnetic field

• To calculate the speed of a moving charge

• To find the direction of induced current

Which tool is commonly used to determine the direction of the induced current?

• Faraday's law

• Ampere's law

• Right-hand rule

• Left-hand rule

In the first example, what is the direction of the induced current in the loop?

• Into the screen

• Clockwise

• Counterclockwise

• Out of the screen

Why is magnetic flux considered a scalar quantity?

• It has both magnitude and direction

• It is a vector product

• It is a dot product

• It only has direction

In the second example, what happens to the induced magnetic field when the original magnetic field decreases?

• It remains constant

• It decreases

• It opposes the change

• It increases

What happens to the induced current when the area of the loop decreases?

• It remains unchanged

• It increases

• It decreases

• It becomes zero

In the example where the loop is rotated, what is the direction of the induced current?

• Into the screen

• Clockwise

• Counterclockwise

• Out of the screen

What shape does the magnetic field take around a current-carrying wire?

• Rectangle

• Triangle

• Circle

• Square

What is the shape of the magnetic field outside the plane of the loop?

• Cube

• Torus

• Cylinder

• Sphere

What happens to the induced magnetic field when there is no change in magnetic flux?

• It becomes infinite

• It remains zero

• It increases

• It decreases