AP EAMCET Engineering 20 Apr 2019 Shift 1 Paper

To measure a magnetic field between the magnetic poles of a loud speaker, a small coil having 30 turns and 2.5 cm area is placed perpendicular to the field and removed immediately. If the total charge flown through the coil is 7.5 × 10−3 C. and the total resistance of wire and galvanometer is 0.3 Q. then the magnitude of the magnetic field is