A metallic disc of radius r is made of a material of

Last updated: 6/13/2023

A metallic disc of radius r is made of a material of negligible resistance and can rotate about a con ducting horizontal shaft A smaller non conducting disc of radius a is fixed onto the same shaft and has a massless cord wrapped around it which is attached to a small object of mass m as shown Tw ends of a resistor of resistance R are connected to the perimeter of the disc and to the shaft by sliding contacts The system is then placed into a uniform horizontal magnetic field B and the mass m is re leased Find the terminal angular velocity with which the disc will rotate finally Take r 10cm a 2cm R 50 gm g 10 m s2 R A 200 rad s C 100 rad s 1 100 22 B 0 2 T m a m B 300 rad s D 10 rad s