Calculate the work done in rotating a magnet of pole strength `[10^(-2)]` Ampere-m and magnetic length 10 cm through an angle of 60° from its position along the magnetic, meridian. (B = 200T)

Calculate the work done in blowing o soap bubble of radius 5 cm(surface tension of soap solution= 3xx10^-2 N/m).

Calculate the amount of work done for a wire which area of cross section 10^-6m^2 and length 1.5m to increase the length 4 xx 10^-3 m. Young's modules of elasticity 2 xx 10^(11N//m^2) .

Electron moving at right angle to a uniform magnetic field complete a circular orbit of 10^(-2) m radius in 10^-10s . What is the magnitude of magnetic field.

In deriving Bernoulli’s equation, we equated the work done on the fluid in the tube to its change in the potential and kinetic energy, (a) What is the largest average velocity of blood flow in an artery of diameter 2 xx10^-3 m if the flow must remain laminar? (b) Do the dissipative forces become more important as the fluid velocity increases? Discuss qualitatively.

A proton enters a magnetic field of flux density 1.5Wb/m^2 with a speed of 2×10^7 m/s at angle of 30^o with the field. Find the force on the proton .