Question
Question: A long straight wire of radius R = 1.5 mm carries a steady current i<sub>0</sub> of 30 A. Then the m...
A long straight wire of radius R = 1.5 mm carries a steady current i0 of 30 A. Then the magnetic field at a radial distance r = 1 mm from the centre of the wire is-
A
Zero
B
4.0 mT
C
2.67 mT
D
None of these
Answer
2.67 mT
Explanation
Solution
For solid cylindrical wire
Binternal = 