The cylindrical tube of a spray pump has a cross-section of `8.0 cm^2` one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is `1.5 m min^-1`, what is the speed of ejection of the liquid through the holes ?

A cylindrical tube opened at both ends is made of iron sheet which is 2cm thick. If the outer diameter is 15 cm and its length is 100cm, find how many cubic centimeters of iron has been used in making the tube?

A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A. estimate the magnitude of B inside the solenoid near its centre.

A cylindrical water tank of diameter 1.4 m and height 2.1 m is being fed by a pipe of diameter 3.5 cm through which water flows at the rate of 2 metre per second. In how many time the tank will be filled?

A long solenoid with 15 turns per cm has a small loop of area 2.0 cm^2 placed inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0 A to 4.0 A in 0.1 s, what is the induced emf in the loop while the current is changing?

A current of 1.8 A flows through a wire of cross-sectional area 0.5 mm^(2) ? Find the current density in the wire. If the number density of conduction electrons in the wire is 8.8 xx 10^(28) m^(-3) , find the drift speed of electrons.

A conductivity cell has its electrodes 1 cm apart and each electrode has area of cross-section 2 cm^(2) , when filled with M/50 solution of sodium acetate, the cell shows a resistance of 166.5 ohms. Calculate the molar conductance of sodium acetate solution at the givne concentration.

Two rods X and Y are of equal lengths. Each rod has its ends at temperature T_1 and T_2 . What is the condition that will ensure equal rate of flow of heat through the rods X and Y?