(a) Th emagnetic field in a region varies as shown in figure (38-E1). Calculate the average induced emf in a conducting loop of area 2.0×10−3m2 placed perpendicular to the field in each of the 10 ms intervals shown. (b) In which intervals is the emf not constant? Neglect the behaviour near the ends of 10 ms intervals.
ϕ2=B.A=0.01×2×10−3
=2×10−5[Sinceϕ1=0]
dϕ=2×10−5
e=−dϕdt=−2×10−510×10−3
=2×10−3=−2mV
ϕ3=B.A=0.03×2×10−3
=6×10−5
dϕ=4×10−5
e=−dϕdt=−4mV
ϕ4=B.A=0.01×2×10−3
=2×10−5
dϕ=−4×10−5
e=−dϕdt=4mV
ϕ5=B.A.=0
dϕ=−2×10−5
e=−dϕdt=−(−2)×(10−5)10×10−3=2mV.
(b)Emf is not constant in case of →10−20 ms and 20 ms -30 ms as -4 mV and 4m.