Ohm’s law for magnetic circuits is _________.
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What happens to the MMF when the magnetic flux decreases?
Calculate the MMF when the magnetic flux is 5Wb and the reluctance is 3A/Wb.
What is the inductance of a coil in which a current of 0.1A increasing at the rate of 0.5 A/s represents a power flow of 0.5 watt?
A coil of 100 turns is wound on a torroidal magnetic core having a reluctance of 104 AT/Wb. When the coil current is 5 A and is increasing at the rate of 200 A/s, the voltage across the coil would be (assume coil resistance to be 2 Ω)
The field winding of a dc electro-magnet is wound with 960 turns and has a resistance of 50 Ω. The excitation voltage is 230 V and the magnetic flux linking the coil is 5 mWb. The energy stored in the magnetic field is
The flux in a magnetic core is alternating sinusoidally at a frequency of 600 Hz. The maximum flux density is 2 Tesla and the eddy current loss is 15 Watts. What would be the eddy current loss in the core if the frequency is raised to 800 Hz and the maximum flux density is reduced to 1.5 Tesla?
Two inductances of 15 mH and 25 mH are connected in series such that their fluxes oppose each other. They are so placed that the coefficient of coupling is 0.8. The value of mutual inductance between them will be
The property of a material which opposes the production of magnetic flux in it is known as:
The laws of electromagnetic induction are summarized in the following equation:
EMF induced in a coil rotating in a uniform magnetic field will be maximum when the
The emf induced in a conductor rotating in a bipolar field is
The area of his hysteresis loss is a measure of:
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25 docs|247 tests
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