If a coil of 40 turns and area 4.0
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If a coil of 40 turns and area 4.0 cm² is suddenly removed from a magnetic field, it is observed that a charge of 2.0×10⁻⁴ C flows into the coil. If the resistance of the coil is 80Ω, the magnetic flux density in Wb /m² is(a) 0.5(b) 1.0(c) 1.5(d) 2.0