Electrical Engineering - Magnetism and Electromagnetism - Discussion

Discussion :: Magnetism and Electromagnetism - General Questions (Q.No.5)

5. 

When the current through the coil of an electromagnet reverses, the

[A]. direction of the magnetic field reverses
[B]. direction of the magnetic field remains unchanged
[C]. magnetic field expands
[D]. magnetic field collapses

Answer: Option A

Explanation:

No answer description available for this question.

Praveen said: (Sep 23, 2011)  
Apply right hand thumb rule and see.

Rakesh L said: (Jun 26, 2015)  
B = meu*i/(2pie r), i.e magnetic field directly proportional to I in both magnitude and direction.

Bababhokali said: (Jul 9, 2016)  
Ya apply thumb rule.

Bharath said: (Jul 27, 2016)  
@Praveen.

It is not right hand thumb rule it is left hand thumb rule.

Uma said: (Sep 6, 2016)  
It uses left-hand thumb rule.

Ravi Teja said: (Dec 3, 2016)  
Left-hand thumb rule at the middle-finger all was current direction.

Vishnu said: (Aug 18, 2017)  
The current direction is reverse so the direction of magnetic field reverse.

Swetha said: (Aug 6, 2018)  
Thumb rule should be apply.

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