Electromagnetic Induction Concepts

The video tutorial covers the concept of electromagnetic induction, demonstrated through an experiment involving a solenoid and a magnet. It explains Faraday's observations and laws, highlighting the relationship between magnetic flux and electromotive force. Fleming's rules for determining the direction of induced current in motors and generators are discussed. Lenz's law is introduced, emphasizing its opposition to the cause of induction and its compliance with the conservation of energy.

What is the initial reading of the galvanometer when the magnet is stationary near the solenoid?

• Positive deflection

• Fluctuating

• Zero

• Negative deflection

What happens to the galvanometer reading when the north pole of the magnet is moved towards the solenoid?

• It deflects to the left

• It deflects to the right

• It remains zero

• It fluctuates

How can the current in the solenoid be increased?

• By keeping the magnet stationary

• By increasing the motion of the magnet

• By decreasing the number of turns

• By using a weaker magnet

According to Faraday, what happens when there is no relative motion between the magnet and the coil?

• The magnetic flux remains constant

• An EMF is induced

• The magnetic flux changes

• The galvanometer deflects

What is the relationship between the rate of change of magnetic flux and the induced EMF?

• There is no relationship

• They are directly proportional

• They are inversely proportional

• They are equal

Which rule is used to determine the direction of induced current in generators?

• Faraday's law

• Lenz's law

• Fleming's right-hand rule

• Fleming's left-hand rule

In Fleming's right-hand rule, what does the thumb represent?

• Direction of the magnetic field

• Direction of the induced current

• Direction of movement of the conductor

• Direction of the electric field

What does Lenz's law state about the direction of the induced EMF?

• It supports the cause that produces it

• It opposes the cause that produces it

• It is unrelated to the cause

• It enhances the cause that produces it

Which law does Lenz's law obey that states every action has an equal and opposite reaction?

• Ohm's law

• Faraday's law

• Newton's third law

• Law of conservation of energy

What is the principle behind Lenz's law in terms of energy?

• Energy is variable in a system

• Energy is constant in a system

• Energy can be destroyed

• Energy can be created