AP EAMCET202023 Sep 2020Morning ShiftPhysicsMagnetic Effects of CurrentActual
Magnetic field d B to a current element at any point on its axis is _____
Options
- Aminimum
- Bzero
- Cyaries between minimum and maximum
- Ddepends on the position of the point
Correct answer
B. zero
Step-by-step solution
From the Biot-Savart's law, Magnetic field due to current element d B = μ o i d l sin θ 4 π r 2 The magnetic field on a current element is directly proportional to the sine of the angle between the current element and the position vector. The angle for a point on axis θ = 0 so d B = 0