Horizontal component of the earth’s magnetic field at the
place is 3 0 × 10–5 T Solution
Initial flux through the coil,
FB (initial) = BA cos q
= 3 0 × 10–5 × (p ×10–2) × cos 0°
= 3p × 10–7 Wb
Final flux after the rotation,
FB (final)    = 3