For a triode valve, the amplification factor is 50 and its plate resistance is `4 x 10^4 ohm'. Calculate the mutual conductance of the valve.

1N salt solution surrounding two platinum electrodes, 2.1 cm apart and 6.3 cm^(2) in area was found to offer a resistance of 50 ohm. Calculate the equivalent conductance of the solution.

0.5 N solution of an electrolyte placed between two platinum electrodes 2.0 cm apart and area of cross section 4.0 sq. cm has a resistance of 250 ohm . Calculate the equivalent conductance of the solution.

At a certain temperature the specific conductance of 0.40M KCl solution is 4.96xx10^-2 ohm^-1cm^-1 . Calculate its molar conductance.

A 50 volt battery is connected across a 10 ohm resistor. If the current is 4.5 A, calculate the internal resistance of the battery.

The specific conductance of a 0.12N solution of an electrolyte is 2.4xx10^-2 ohm^-1cm^-1 Calculate its equivalent conductance.

A point charge of 3 xx 10^(-9)C is released from rest in a uniform electric field and moves a distance of 5cm after which its kinetic energy becomes 4.5 xx 10^(-5)J . Calculate the magnitude of the electric field.