railway RRB Technician Grade 1 Mock Test 2024 Physics Moving Charges and Magnetism Biot-Savart Law

20 A current is flowing through a straight wire. The intensity of magnetic field at a point 10 cm from the wire will be_______. 

1
4 × 10-5 Wb/m2
2
4 × 105 Wb/m2
3
2 × 10-5 Wb/m2
4
8 × 10-5 Wb/m2
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