A current of 10 A is flowing from east to west in a long straight wire kept on a horizontal table. The magnetic field developed at a distance of 10 cm due north on the table is : [1]
A. 2 x 10-5 T, acting downwards
B. 2 x 10-5 T, acting upwards
C. 4 x 10-5 T, acting upwards
D. 4 x 10-5 T, acting upwards
Answer:A
A current of 10 A is flowing from east to west in a long straight wire kept on a horizontal table. The magnetic field developed at a distance of 10 cm due north on the table is : [1]
A. 2 x 10-5 T, acting downwards B. 2 x 10-5 T, acting upwards C. 4 x 10-5 T, acting upwards D. 4 x 10-5 T, acting upwards
Explanation: \(\vec{B}=\frac{\mu_0 I}{2 \pi r}\)