Q. Flux density is a measure of the number of magnetic flux lines perpendicular to an area of cross-section. If a discontinuity is in the plane of the unit area, the strongest magnetic article indication will be formed when the discontinuity is:

• (A) Inclined at 45º to the flux lines
• (B) Parallel to the flux lines
• (C) 90º to the flux lines
• (D) 135º to the flux lines