# Electrical Engineering - Magnetism and Electromagnetism - Discussion

Discussion Forum : Magnetism and Electromagnetism - General Questions (Q.No. 5)
5.
When the current through the coil of an electromagnet reverses, the
direction of the magnetic field reverses
direction of the magnetic field remains unchanged
magnetic field expands
magnetic field collapses
Explanation:
No answer description is available. Let's discuss.
Discussion:
9 comments Page 1 of 1.

Saikiran kiran said:   4 years ago
How to apply left-hand rule? Please tell me.
(1)

Swetha said:   6 years ago
Thumb rule should be apply.

Vishnu said:   7 years ago
The current direction is reverse so the direction of magnetic field reverse.

Ravi Teja said:   7 years ago
Left-hand thumb rule at the middle-finger all was current direction.

Uma said:   8 years ago
It uses left-hand thumb rule.

Bharath said:   8 years ago
@Praveen.

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

Bababhokali said:   8 years ago
Ya apply thumb rule.

Rakesh L said:   9 years ago
B = meu*i/(2pie r), i.e magnetic field directly proportional to I in both magnitude and direction.