Class 12 Exam  >  Class 12 Notes  >  8. Magnetic Effect of Current - Theory Sheet, Class 12 Physics

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FAQs on 8. Magnetic Effect of Current - Theory Sheet, Class 12 Physics

1. What is the magnetic effect of current?
Ans. The magnetic effect of current refers to the phenomenon where a current-carrying conductor produces a magnetic field around it. This magnetic field can interact with other magnetic fields or magnetic materials, resulting in various effects such as attraction, repulsion, or the production of an electromotive force.
2. How is the magnetic field around a current-carrying conductor determined?
Ans. According to Ampere's law, the magnetic field around a current-carrying conductor can be determined using the right-hand rule. If the thumb of the right hand points in the direction of the current, the curled fingers will show the direction of the magnetic field lines around the conductor.
3. What are the applications of the magnetic effect of current?
Ans. The magnetic effect of current has several important applications. It is used in electromagnets, which are widely used in various devices such as motors, generators, speakers, and MRI machines. It is also utilized in transformers for electrical power transmission and distribution.
4. How does the magnetic effect of current contribute to the working of an electric motor?
Ans. In an electric motor, the magnetic effect of current is utilized to convert electrical energy into mechanical energy. When a current-carrying conductor is placed in a magnetic field, a force is exerted on the conductor, causing it to rotate. This rotational motion is used to drive the motor's mechanical components.
5. What is the relationship between the strength of the magnetic field and the current flowing through a conductor?
Ans. The strength of the magnetic field produced by a current-carrying conductor is directly proportional to the magnitude of the current flowing through the conductor. In other words, increasing the current will result in a stronger magnetic field, while decreasing the current will weaken the magnetic field.
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