MEDIUM
7th CBSE
IMPORTANT
Earn 100

Read the passage and answer the questions that follow.
                                                                                      About Induction
We have learnt that when electrical current flows in a conductor, a magnetic field is created around it. In a similar manner, if we move a wire inside a magnetic field there will be an electrical current generated in the wire. Current is produced when a conductor is moved through a magnetic field because the magnetic lines of force are applying a force on the free electrons in the conductor and causing them to move. This process of generating current in a conductor by placing the conductor in a changing magnetic field is called induction. This is called induction because there is no physical connection between the conductor and the magnet. The current is said to be induced in the conductor by the magnetic field. One requirement for this electromagnetic induction to take place is that the conductor, which is often a piece of wire, must be perpendicular to the magnetic lines of force in order to produce the maximum force on the free electrons. The direction that the induced current flows are determined by the direction of the lines of force and by the direction the wire is moving in the field.

Explain the phenomenon of induction?

Important Questions on Electric Current and Its Effects

MEDIUM
7th CBSE
IMPORTANT

Read the passage and answer the question that follow.

About Induction

We have learnt that when electrical current flows in a conductor, a magnetic field is created around it. In a similar manner, if we move a wire inside a magnetic field there will be an electrical current generated in the wire. Current is produced when a conductor is moved through a magnetic field because the magnetic lines of force are applying a force on the free electrons in the conductor and causing them to move. This process of generating current in a conductor by placing the conductor in a changing magnetic field is called induction. This is called induction because there is no physical connection between the conductor and the magnet. The current is said to be induced in the conductor by the magnetic field. One requirement for this electromagnetic induction to take place is that the conductor, which is often a piece of wire, must be perpendicular to the magnetic lines of force in order to produce the maximum force on the free electrons. The direction that the induced current flows is determined by the direction of the lines of force and by the direction the wire is moving in the field.

What is the requirement for maximum induction?

MEDIUM
7th CBSE
IMPORTANT

Read the passage and answer the question that follow.

About Induction

We have learnt that when electrical current flows in a conductor, a magnetic field is created around it. In a similar manner, if we move a wire inside a magnetic field there will be an electrical current generated in the wire. Current is produced when a conductor is moved through a magnetic field because the magnetic lines of force are applying a force on the free electrons in the conductor and causing them to move. This process of generating current in a conductor by placing the conductor in a changing magnetic field is called induction. This is called induction because there is no physical connection between the conductor and the magnet. The current is said to be induced in the conductor by the magnetic field. One requirement for this electromagnetic induction to take place is that the conductor, which is often a piece of wire, must be perpendicular to the magnetic lines of force in order to produce the maximum force on the free electrons. The direction that the induced current flows is determined by the direction of the lines of force and by the direction the wire is moving in the field.

What determines the direction of induced current?

EASY
7th CBSE
IMPORTANT

Read the passage and answer the question that follows.

About Induction

We have learnt that when electrical current flows in a conductor, a magnetic field is created around it. In a similar manner, if we move a wire inside a magnetic field there will be an electrical current generated in the wire. Current is produced when a conductor is moved through a magnetic field because the magnetic lines of force are applying a force on the free electrons in the conductor and causing them to move. This process of generating current in a conductor by placing the conductor in a changing magnetic field is called induction. This is called induction because there is no physical connection between the conductor and the magnet. The current is said to be induced in the conductor by the magnetic field. One requirement for this electromagnetic induction to take place is that the conductor, which is often a piece of wire, must be perpendicular to the magnetic lines of force in order to produce the maximum force on the free electrons. The direction that the induced current flows is determined by the direction of the lines of force and by the direction the wire is moving in the field.

Why is current produced when a conductor rod is moved between opposite poles of a magnet?

EASY
7th CBSE
IMPORTANT
Which of the following will be used to make a fuse wire?
MEDIUM
7th CBSE
IMPORTANT
Which of the following electromagnets will be the strongest?
EASY
7th CBSE
IMPORTANT
Which of these appliances does not work on magnetic effect of current?
HARD
7th CBSE
IMPORTANT
Birds sitting on overhead cables do not get electric shock. Why?