21. Which of the following statements are correct?
1. Change in magnetic field produces induced current.
2. Flow of current in a conductor produces magnetic field.
3. Magnetic field related to coil can be produced by motion between conductor and coil.
1. Change in magnetic field produces induced current.
2. Flow of current in a conductor produces magnetic field.
3. Magnetic field related to coil can be produced by motion between conductor and coil.
22. What will be the reverse of permeability?
23. The potential difference between the terminals of an electric heater is 60V when it draw of current of 4A from the source. What current will the heater draw if the potential difference is increased to 172.5 V?
24. A fuse wire is made of
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