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Magnetic Effects of Electric Current Video Lecture | Science Class 7

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FAQs on Magnetic Effects of Electric Current Video Lecture - Science Class 7

1. What are the magnetic effects of electric current?
Ans. The magnetic effects of electric current refer to the phenomena where an electric current produces a magnetic field around it. This magnetic field can interact with other magnets or magnetic materials, resulting in various effects such as attraction, repulsion, and the creation of magnetic fields.
2. How does an electric current produce a magnetic field?
Ans. When an electric current flows through a wire, it creates a circular magnetic field around the wire. The direction of the magnetic field can be determined using the right-hand thumb rule, where if we hold the wire with our right hand and point the thumb in the direction of the current, the curled fingers will indicate the direction of the magnetic field lines.
3. What are the applications of the magnetic effects of electric current?
Ans. The magnetic effects of electric current have various practical applications. Some of the common applications include electric motors, generators, transformers, electromagnetic cranes, magnetic levitation trains, and magnetic resonance imaging (MRI) machines in the medical field.
4. How does an electric motor work based on the magnetic effects of electric current?
Ans. An electric motor works on the principle of the magnetic effects of electric current. When an electric current passes through a coil placed in a magnetic field, it experiences a force due to the interaction between the magnetic field and the current-carrying coil. This force causes the coil to rotate, which is utilized to convert electrical energy into mechanical energy, resulting in the functioning of an electric motor.
5. What is the role of magnetic fields in transformers?
Ans. Transformers utilize the magnetic effects of electric current to transfer electrical energy from one circuit to another. The primary coil of a transformer is connected to an alternating current (AC) source, which produces an alternating magnetic field. This magnetic field induces an alternating current in the secondary coil, allowing the transfer of electrical energy between the two circuits. Transformers are essential in transmitting electricity efficiently over long distances and changing the voltage levels for various applications.
145 videos|326 docs|55 tests

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