Eddy currents are used in:
1. Induction furnace
2. Electromagnetic brakes
3. Speedometers
4. All of these
The slotting processes in a metallic sheet results in:
1. | The increase of the resistance in the path for circulation of current. |
2. | Decrease in the strength of eddy current. |
3. | A feeble in the electromagnetic damping. |
4. | All of these |
1. | A metal block is kept in a changing magnetic field. |
2. | A metal block is kept in a uniform magnetic field. |
3. | A coil is kept in a uniform magnetic field. |
4. | Current is passed in a coil. |
I: | A small magnet takes a longer time in falling into a hollow metallic tube without touching the wall. |
II: | There is an opposition to motion due to the production of eddy currents in a metallic tube. |
Choose the correct option for the above statements:
1. | Both I and II are True and II is the correct explanation for I. |
2. | Both I and II are True and II is not the correct explanation for I. |
3. | I is True but II is False. |
4. | I is False but II is True. |
In which of the following devices, the eddy current effect is not used?
1. Electric heater
2. Induction furnace
3. Magnetic braking in train
4. Electromagnet