Electrical Engineering - Magnetism and Electromagnetism - Discussion

Discussion :: Magnetism and Electromagnetism - General Questions (Q.No.21)

21. 

An electromagnetic field exists only when there is

[A]. an increasing current
[B]. decreasing current
[C]. voltage
[D]. current

Answer: Option D

Explanation:

No answer description available for this question.

Balu. Hyderabad said: (May 24, 2011)  
Electromagnetic field exist only presents of current. Ex:when current carring conductor.

Nagaraju said: (Jan 14, 2012)  
Electromagnetic field exist only present of current.

Prashant Singh said: (Mar 5, 2014)  
emf exists only if there is current over conductor. As in case generator we give exiting to generator to produce more flux which occurs due to current flow.

Vamsi said: (Dec 13, 2014)  
With out voltage there is no possibility to flow current. It may be either voltage or current.

Santumaharaj said: (Apr 26, 2016)  
EMF exist only when the current is present in that circuit.

Satnam said: (Nov 19, 2016)  
Electromagnetic field exists when a stationary conductor cuts alternating magnetic field. This shows that emf exist only when a change of current exist.

Prasath Vetri said: (Jan 17, 2017)  
Electromagnetic field (ie) a coil will act as a magnet. A coil becomes a magnet when a supply is given across its terminals. Automatically a voltage is given to the coil, current will start to flow. The current depends on the usage of that magnetic field in the secondary circuit. In overall supply must be present. That's it. Either voltage or current, both are wrong. Power will be the right answer.

Swetha said: (Aug 7, 2018)  
The magnetic field produced by applying current. So the answer is current.

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