CBSE Class 10 Science Notes Chapter 13 Magnetic Effects of Electric Current

CBSE Class 10 Science Notes - Chapter 13: Magnetic Effects of Electric Current

Magnetic Field and Force: Electric current produces a magnetic field. The magnetic field around a current-carrying conductor can be demonstrated using a compass.
Right-Hand Rule: The direction of the magnetic field around a current-carrying conductor is given by the right-hand thumb rule.
Electromagnet: A coil of wire (solenoid) with current flowing through it becomes a magnet, known as an electromagnet. The strength of the electromagnet depends on the number of coils, current, and the core material.
Electric Motor: A device that converts electrical energy into mechanical energy through the interaction of a current-carrying coil and a magnetic field.
Magnetic Induction: When a conductor moves through a magnetic field, an electric current is induced. This is known as electromagnetic induction.
Applications: Electromagnetic induction is used in generators, transformers, and induction cookers.

These key concepts cover the magnetic effects of electric current, which are essential for understanding electromagnetism and its applications.

Most Important Science Class 10 Questions Answers For Board Examination

Here are some of the top most asked questions from CBSE Science Chapter 13: Magnetic Effects of Electric Current in the last 5 board exams:

What is the right-hand thumb rule? Explain its application.
- The right-hand thumb rule helps in determining the direction of the magnetic field around a current-carrying conductor. Point your thumb in the direction of the current, and your curled fingers show the direction of the magnetic field.
What is an electromagnet? Explain its working and applications.
- An electromagnet is a coil of wire with current flowing through it, creating a magnetic field. The strength of the electromagnet increases with more turns of wire and higher current. It is used in cranes, electric motors, and transformers.
Explain the working principle of an electric motor.
- An electric motor works on the principle of the magnetic effect of electric current. When a current-carrying coil is placed in a magnetic field, it experiences a force that causes it to rotate.
What is electromagnetic induction?
- Electromagnetic induction occurs when a changing magnetic field induces an electric current in a conductor. This principle is used in the functioning of generators and transformers.

These questions cover the fundamental concepts that have been frequently asked in board exams.

Here are some multiple-choice questions (MCQs) based on CBSE Class 10 Science Chapter 13: Magnetic Effects of Electric Current:

What is the direction of the magnetic field around a current-carrying wire?
- a) Parallel to the wire
- b) Perpendicular to the wire
- c) In the direction of current
- d) In concentric circles around the wire
Answer: d) In concentric circles around the wire
What is the effect of increasing the current in a solenoid on the strength of the magnetic field?
- a) The strength of the magnetic field decreases
- b) The strength of the magnetic field increases
- c) No change in the strength
- d) The direction of the magnetic field changes
Answer: b) The strength of the magnetic field increases
Which device works on the principle of electromagnetic induction?
- a) Electric motor
- b) Generator
- c) Transformer
- d) Both b and c
Answer: d) Both b and c
Which of the following is used in an electric motor?
- a) A coil of wire
- b) A permanent magnet
- c) A magnet and a coil of wire
- d) None of the above
Answer: c) A magnet and a coil of wire
What is the role of the commutator in an electric motor?
- a) To reverse the direction of the current
- b) To maintain a continuous rotation
- c) To increase the current
- d) To protect the motor from overloading
Answer: b) To maintain a continuous rotation