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good morning sir please explain this problem problem is given in image please explain it fast

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2 years ago

```							Answer 15. WHEN THE ELECTRIC FIELD IS APPLIED,  	IT WILL PRODUCE TORQUE (there will be friction also due to rough horizontal surface )	THE NET ELECTRIC FORCE WILL BE ZERO.   torque = R . F. sinx                                              where F is qE but q is not given so q = (lambda)(R.dx)        where x is the angle where the charge is distributed TARGET: TO find TORQUE independent of x (angle)torque = ∫ (lambda . R .dx ) E sinx limit of integration will be 0 to pi/ 2 and this torque will be multiply by 2 becouse the torque is produced by both + and – charge torque = 2 X ∫ (lambda . R .dx ) E sinx             limit of integration will be 0 to pi/ 2 ON SOLVING, WE GET torque = (2)( lambda)(  E )( R2)AS THE MOTION IS PURE ROLLING,torque – (torque produced by frictional force ) = (moment of inertia ) (alpha )                                                      where alpha = angular acceleration = f/(mR)  (2)( lambda)(  E )( R2)    –  f(R)    =   I (ALPHA )  (2)( lambda)(  E )( R2)    –  f(R)    =    I X f/(mR)PUT I = mR2and sove for f (frictional force)f = (lambda )(E)(R)__________________________ANSWER
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2 years ago
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