Magnetic flux passing through a coil is initially `4xx 10^-4` Wb. It reduces to 10% of its original value in t second. If the emf induced is 0.72 mV then t in second is

Magnetic flux passing through a coil is initially 4xx10^-4 Wb. It reduces to 10% of its original value in 't' second. If the e.m.f. induced is 0.72 mV then find 't' in seconds.

The magnetic flux through a coil is 4 xx 10^(-4) Wb//m^(2) at time t=0 . It reduces to 10% of its original value in 't' seconds. If the induceds e.m.f. Is 0.72 mV, then the time t is

The magnetic flux through a coil is 5 xx10^-4 Wb at time t = 0. It reduces to ten percent of its original value in 0.5s. The magnitude of e.m.f. induced in the coil is

The megnetic flux through a coil is 5 xx 10^(-4) Wb. At time t=0. it reduces to ten percent of its original value in 0.5 s. The magnitude of e.m.f. induced in the coil is

A coil of effective area 4m^2 is placed at right angles to a magnetic field of induction 0.05Wb//m^2 . If the field is decreased to 20% of its original value in10 seconds, find the e.m.f. induced in the coil.