ElectrostaticsHard

Question

A non-conducting disc of mass = 2kg, total charge = +1C uniformly distributed, is placed on a rough horizontal non-conducting surface with its cross-section in vertical plane as shown. A uniform horizontal electric field E is now switched on. Find maximum magnitude of electric field E in (N/C) so that the disc rolls purely. [g = 10 ms-2]
           

Options

A.10
B.14
C.12
D.18

Solution

           
aCM = αr
⇒ r ⇒ qE - μmg = 2μmg ⇒ = 3μg ⇒ E = = 12

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