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The observation made of Faraday from the...

The observation made of Faraday from the experiments on electromagnetic induction is (are) that ________.
(A) the deflection in the galvanometer increases when a strong magnet is used
(B) the induced current in the coil is alternating in nature

A

Only A is true

B

Only B is true

C

Both A and B are true

D

Both A and B are false

Text Solution

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The correct Answer is:
C
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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

Consider Experiment 2, Art. 4(a). 3, (a) What would you do to obtain a large deflection of the galvanometer ? (b) How would you demonstrate the presence of an induced current in the absence of a galvanmeter ?

When a magnet is moved towards a coil the direction of induced current is clockwise. If the magnet is moved away from the coil, the direction of induced current will be

(a) What do you understand by the term "electromagnetic induction"? Explain with the help of a diagram. ltBrgt (b) Name one devices which works on the phenomenon of electromagnetic induction. (c ) Describe different ways to induce current in a coil of wire.

PEARSON IIT JEE FOUNDATION-ELECTROMAGNETISM-CONCEPT APPLICATION ( LEVEL 1)
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  4. When there is abetween a magnet and a conductor, an EMF is induced in ...

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  5. Match the entries in Column A with the appropriate ones in Column B.

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  7. A transformer contains 250 and 150 turns in its primary and secondary ...

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  10. Magnetic field lines inside a solenoid

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  12. If a bar of steel is placed in a solenoid, then it changes to .

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  13. The work done in bringing a bar magnet near a coil of radius 14 cm is ...

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  14. The observation made of Faraday from the experiments on electromagneti...

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  15. The strength of magnetic field due to a straight current carrying cond...

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  16. The magnetic lines of force around a current carrying straight conduct...

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  17. In the phenomenon of electromagnetic induction, energy of the coil or ...

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  18. A coil is moved towards a stationary magnet. The voltage induced in th...

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  19. Both the galvanometer and galvanoscope can be used to.

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  20. A magnet and a coil are taken. In which of the following cases, emf is...

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