1.

A uniform conducting ring of mass `pi` kg and radius 1 m is kept on smooth horizontal table. A uniform but time varying magnetic field `B = (hat (i) + t^(2) hat (j))T` is present in the region, where t is time in seconds. Resistance of ring is `2 (Omega)`. Then Time (in second) at which ring start toppling isA. `10/(pi)sec`B. `20/(pi)sec`C. `5/(pi)sec`D. `25/(pi)sec`

Answer» Correct Answer - A
`1=1/R |(dphi)/(dt)|=1/2pixx1^(2): 2t=pit`
The ring will start toppling when
`tau_(m)=tau_(g)`
`impliesIAB_(x)=mgr`
`impliespitxxpixx1^(2)xx1=pixx10xx1`
`impliest=10/(pi)`sec


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