Q. Applying the theory of the ‘Right Hand Rule’, a longitudinal surface defect in a round bar is detected by ‘current passing in a direction parallel to the direction of expected defects’ because: (Solved)
1. The current direction is in line with the defect
2. The magnetic field is at right angles to the defect
3. It makes no difference
4. The magnetic field is parallel to the defect
- b. The magnetic field is at right angles to the defect