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प्रश्न
A rectangular coil of area 6 cm2 having 3500 turns is kept in a uniform magnetic field of 0.4 T. Initially, the plane of the coil is perpendicular to the field and is then rotated through an angle of 180°. If the resistance of the coil is 35 Ω, find the amount of charge flowing through the coil.
उत्तर
Given data:
Area A = 6 × 10-4 m2
n = 3500
B = 0.4 T
Q1 = 180°
R = 35Ω
amount of charge Q =?
Q = di.dt = `ε/"R"` dt
Q = `("nBA" "d"/"dt" (cos theta))/"R" xx "dt"`
Q = `"nBR"/"R" [cos theta^circ - cos 180^circ]`
Q = `(3500 xx 0.4 xx 6 xx 10^-4[2])/35`
`= 80 xx 6 xx 10^-4`
`= 480 xx 10^-4 "C"`
= `48 xx 10^-3`C
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