Current I is flowing in a long conducting wire. The magnetic induction at a distance r from it is 0.4 tesla. Then its value at double the distance will be
Correct answer: B. 0.2 T
- A. 1.6 T
- B. 0.2 T
- C. 0.8 T
- D. 0.1 T
Explanation
B is the correct answer. As explained earlier, doubling the distance (r) from the wire divides the magnetic field strength by 2 due to the inverse proportionality. In this case, 0.4 T divided by 2 results in 0.2 T, which aligns with the formula's prediction.
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Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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