A magnetic field of 2×10⁻² T acts at right angles to a coil of area 100 cm², with 50 turns. The average emf induced in the coil is 0.1 V when it is removed from the field in t second. The value of t is

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(2) 0.1 s. The flux linkage falls from NBA to zero, so ε=(NBA)/t and therefore t=(NBA)/ε. A=100 cm²=10⁻² m². NBA=50×2×10⁻²×10⁻²=10⁻² Wb. t=(10⁻²)/(0.1)=0.1 s.

A magnetic field of 2×10⁻² T acts at right angles to a coil of area 100 cm², with 50 turns. The average emf induced in the coil is 0.1 V when it is removed from the field in t second. The value of t is

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