48 Questions
What is the name of the law that describes the principle of electromagnetic induction?
Faraday's Law of Electromagnetic Induction
What is the unit of magnetic flux?
Weber
What is the angle between the magnetic field and the normal to the loop when the magnetic flux is maximum?
0 degrees
What happens to the induced emf when the magnetic field is parallel to the surface?
It becomes zero
What is the relationship between the induced emf and the rate of change of magnetic flux?
The induced emf is directly proportional to the rate of change of magnetic flux
What is the purpose of the minus sign in Faraday's Law of Electromagnetic Induction?
To indicate the direction of the induced emf
What is the direction of the induced current in a conductor?
Opposite to the direction of the change in magnetic flux
What is the condition for inducing a voltage in a wire?
The magnet must be moving
What happens when a south pole of a magnet approaches a loop?
The induced emf generates a current that produces a magnetic field opposing the increase in the magnetic field strength
In a solenoid, how is the magnetic flux calculated?
By multiplying the cross-sectional area by the number of loops
What is the principle behind electromagnetic induction?
The changing magnetic field induces a current
What is self-induction?
When a changing magnetic field produced by a changing current in a wire induces a voltage along the same wire
What does Lenz's Law state?
The induced current will create a magnetic field that opposes the change in the magnetic flux
What happens when the south pole of a magnet recedes from a loop?
The induced current generates a magnetic field that attracts the south pole
What is the purpose of the Right Hand Rule?
To determine the direction of the induced current
What is the main application of electromagnetic induction?
Electrical generators
What is the cause of the induced emf in a wire?
A changing magnetic field near the wire
What is the direction of the magnetic field generated by the induced current when a south pole of a magnet approaches a loop?
Opposite the direction of the south pole's field
What is the magnetic flux through a loop of area A in the presence of a uniform magnetic field B?
φ = B A cos θ
What is the purpose of the induced current in a solenoid when a magnetic field is changing?
To oppose the change in the magnetic field strength
What is the effect of self-induction in a wire?
It generates a voltage along the same wire
What is the effect of increasing the number of turns N in a loop on the induced emf?
The induced emf increases
What is the principle behind the operation of electrical generators?
Electromagnetic induction
Why does a magnetic field parallel to the surface of a loop not induce a current?
Because the magnetic field does not pass through the surface
What is the relationship between the induced current and the change in magnetic flux?
The induced current is inversely proportional to the change in magnetic flux
What is the relationship between the rate of change of magnetic flux and the induced emf?
The induced emf is directly proportional to the rate of change of magnetic flux
What is the role of the Right Hand Rule in determining the direction of the induced current?
It helps to determine the direction of the induced current
What is the purpose of the direction of the induced emf in a conductor?
To oppose the change in magnetic flux
What happens when a south pole of a magnet moves away from a loop?
The induced current generates a magnetic field that attracts the south pole
What is the effect of changing the angle θ between the magnetic field and the normal to the loop on the magnetic flux?
The magnetic flux decreases with increasing θ
What is the main application of electromagnetic induction?
Electrical generators
What is the condition for the induced emf to be maximum?
When the magnetic field is perpendicular to the surface
When the magnetic field is perpendicular to the loop's area, what is the angle between the magnetic field and the normal to the loop?
0°
What happens to the induced emf when the loop's area is increased while the magnetic field remains constant?
It increases
A conductor is moving through a uniform magnetic field. What is the direction of the induced emf?
Perpendicular to the direction of motion
What is the effect of increasing the number of turns in a loop on the induced emf?
It increases
A coil is rotating in a uniform magnetic field. What is the direction of the induced current?
Perpendicular to the direction of rotation
What happens to the magnetic flux when the angle between the magnetic field and the normal to the loop is 45°?
It becomes half
A magnet is moving towards a coil. What is the direction of the magnetic field generated by the induced current?
Opposite to the direction of the moving magnet
What is the effect of changing the magnetic field while keeping the loop's area constant?
The magnetic flux decreases
What is the purpose of the induced current in a solenoid when a magnetic field is changing?
To oppose the change in magnetic flux
What is the direction of the magnetic field generated by the induced current when a south pole of a magnet approaches a loop?
Opposite to the south pole's field
What is the effect of increasing the number of turns N in a loop on the induced emf?
It increases the induced emf
What is the role of Lenz's Law in electromagnetic induction?
It ensures that the direction of the induced emf always works to counteract the change that caused it
What happens when the magnetic field is parallel to the surface of a loop?
The magnetic flux is zero
What is the purpose of electromagnetic induction in electrical generators?
To convert mechanical energy into electrical energy
What is the effect of self-induction in a wire?
It generates a voltage in the opposite direction as the current
What is the relationship between the rate of change of magnetic flux and the induced emf?
The induced emf is proportional to the rate of change of magnetic flux
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