Avery thin circular disk of radius r = 20.00 cm has charge q = 30.00 mc uniformly distributed on its surface. the disk rotates at a constant angular velocity ω = 5.00 rad/s around the z-axis through its center. calculate the magnitude of the magnetic field strength on the z axis at a distance d = 2.000 × 103 cm from the center. note that d > > r.

In a vernier instrument the main scale is in 1/2 mm divisions .vernier is made by redividing 19 such divisions into 20 equal parts. calculate the least count of the instrument.

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

In a system, when potential energy decreases, then entropy also decreases. true false