railway RRB Technician Grade 1 Mock Test 2024 Physics Moving Charges and Magnetism Ampere’s Law

The magnetic field intensity at a distance from a long wire carrying current i is 0.4 tesla. The  magnetic field intensity at a distance 2r is 

1
0.2 tesla
2
0.8 tesla
3
0.1 tesla
4
1.6 tesla
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