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AIPMT 2010 Physics
Q. 45. The activity of a radioactive sample is measured as 
counts per minute at t = 0 and 
counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is:
Sol.
Answer : (4)
Q. 46. A thin ring of radius R meter has charge q coulomb uniformly spread on it. The
ring rotates about its axis with a constant frequency of f revolutions/s. The value
of magnetic induction in Wb/m2 at the centre of the ring is:
Sol .
Answer : (4)