Electromagnetic induction

Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magneic field passing through the loop increases or decreases.

Which of the following statements is incorrect? Bohr gave theory of hydrogen atom and, Yukawa gave theory of nuclear forces. Law of gravitation was discovered by Newton and principle of intertia by Galileo. Laws of photoelectric effect were discovered by Einstein and laws of electromagnetic induction by Faraday. Neutron was discovered by J.J. Thomson and electron was discovered by James Chadwick.

The phenomena of electromagnetic induction is: (a) the process of charging a body. (b) the process of generating magnetic field due to a current passing through a coil. (c) producing induced current in a coil due to relative motion between a magnet and the coil. (d) the process of rotating a coil of an electric motor.

Electromagnetic brakes work on the principle of electromagnetic induction. If a metallic disc or a coil is rotating in a uniform magnetic field, it will experience a torque due to induced currents set up in the disc. According to Lenz's law, induced current is in a direction so as to oppose the rotation. Hence a retarding torque is produced. The rotating wheel of a vehicle is connected to a coil placed in a uniform emf is used to charge a battery. Thus kinetic enery of wheel is stored as chemical energy. The drawback of electromagnetic brake is that induced current or retarding torque is directly proportional to speed of rotation. The speed, therefore, decays exponentially and vehicle will take a long time to stop. Thus, mechanical brakes are used simultaneously. The advantage of electromagnetic brakes is that

Electromagnetic brakes work on the principle of electromagnetic induction. If a metallic disc or a coil is rotating in a uniform magnetic field, it will experience a torque due to induced currents set up in the disc. According to Lenz's law, induced current is in a direction so as to oppose the rotation. Hence a retarding torque is produced. The rotating wheel of a vehicle is connected to a coil placed in a uniform emf is used to charge a battery. Thus kinetic enery of wheel is stored as chemical energy. The drawback of electromagnetic brake is that induced current or retarding torque is directly proportional to speed of rotation. The speed, therefore, decays exponentially and vehicle will take a long time to stop. Thus, mechanical brakes are used simultaneously. The main disadvantage of electromagnetic brakes is that

Electromagnetic brakes work on the principle of electromagnetic induction. If a metallic disc or a coil is rotating in a uniform magnetic field, it will experience a torque due to induced currents set up in the disc. According to Lenz's law, induced current is in a direction so as to oppose the rotation. Hence a retarding torque is produced. The rotating wheel of a vehicle is connected to a coil placed in a uniform emf is used to charge a battery. Thus kinetic enery of wheel is stored as chemical energy. The drawback of electromagnetic brake is that induced current or retarding torque is directly proportional to speed of rotation. The speed, therefore, decays exponentially and vehicle will take a long time to stop. Thus, mechanical brakes are used simultaneously. The working of electromagnetic brakes does not involve

A wire bent as a parabola y=ax^(2) is located in a uniformed magnetic field of induaction B , the vector B being perpendicular to the plane x-y . At moment t=0 a connector starts sliding translationwise from the parabola apex with a constant acceleration omega . Find the emf of electromagnetic induction in the loop thus formed as a function of y

Electromagnetic radiation with maximum wavelengths is :

Electromagnetic radiation of highest frequency is

Dual Nature Of Electromagnetic Radiation