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Q.

An AC rms voltage of 2 V having a frequency of 50 kHz is applied to a condenser of capacity of 10 μF. The maximum value of the magnetic field between the plates of the condenser, if the radius of plate is 10 cm is

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a

0.4 π μT

b

π μT

c

42 π μT

d

40 π μT

answer is C.

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Detailed Solution

i0=V0XC =2VrmsXC =2Vrms1ωc =2Vrms ω c =2 × 2 × 2π × 50 × 103 × 10 × 10-6 =2π2 Amp B¯.dl¯=μ0i0 B.2πR=μ0i0 ;     B.2π 10-1=4π × 10-7×2π2 B=42π μT

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