one more on electo magnetism

IIT JEE 2015 Questions › Electricity and magnetism questions › one more on electo magnetism

A non conducting ring(mass m,radious r,having charge Q) is placed on a rough horizontal surface(in a cylindrical region with tranverse magnetic field ).The field is increasing with time at the rate R and the coefficient of friction b/w the surface and the ring is Î¼.For ring to remain in equilibrium Î¼ should be greater than
(1)Qr²R²/2mg
(2)QrR/2mg
(3)Qr²R/2mg
(4)QrR²/2mg
solver it and say how you have done?

#Physics #Electricity and magnetism

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2 Answers

swaraj jena ·2009-12-24 04:04:03

someone try this

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akari ·2009-12-24 04:33:16

easy one.......
see the rate of change of flux
is B=Rt
Ï†=Ï€r²Rt
dÏ†/dt =Ï€r²R
E=r²R/2
now
dT=df.R
E=Î¼{dm/dq}g .............(equating as u asked limiting case )
Î¼_min = qr²R/2mg

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one more on electo magnetism

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