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Q.

Figure shows a massless wheel of radius R and massless spokes with five charges each of charge as shown and mass m. System is placed in a field created by two large fixed plates having charges +Q0 and Q0, respectively. Entire assembly lies in a smooth horizontal plane. Wheel is placed in horizontal plane and constrained to move in horizontal plane. Initially spokes are released along x & y axis as shown in figure. (A = surface area of plate)

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The instantaneous angular acceleration of the ring is α=QQ0nmAR0 when n=

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answer is 2.

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Detailed Solution

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α=τI=F.R+F.RI=2FRI=2(QQ0A0)R4mR2

α=QQ02mAR0

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Figure shows a massless wheel of radius R and massless spokes with five charges each of charge as shown and mass m. System is placed in a field created by two large fixed plates having charges +Q0 and −Q0, respectively. Entire assembly lies in a smooth horizontal plane. Wheel is placed in horizontal plane and constrained to move in horizontal plane. Initially spokes are released along x & y axis as shown in figure. (A = surface area of plate)The instantaneous angular acceleration of the ring is α=QQ0nmAR∈0 when n=