When disc B is brought in contact with disc A, they acquire a common a – McqOptions

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1.	When disc B is brought in contact with disc A, they acquire a common angular velocity in time t. The average frictional torque on one disc by the other during this period is?
A.	2I3tω
B.	9I2tω
C.	9I4tω
D.	3I2tω
Answer» B. 9I2tω

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