For measuing a potential difference it is more logical to use a potentiometer than a voltmeter. Why?

Explain the principle on which the working of a potentiometre is based. Why is the use of a potentiometer preferred over that of a voltmeter for measurement of e.m.f. of a cell?

Which material is used for potentiometer wire and why?

An electric technician requires a capacitance of 2muF in a circuit across a potential difference of 1kV. A large number of 1muF capacitors are available to him each of which can withstand a potential difference of not more than 400V. Suggest a possible arrangement that requires the minimum number of capacitors.

When an aeroplane flies horizontantally, a potential difference is developed across the two ends of its wings. Why?

When an aeroplane flies horizontally, a potential difference is developed across the two ends of its wings. Why? On what factors does this potential difference depend?

An electrical technician requires a capacitance of 2muF in a circuit across a potential difference of 1 kV. A large number of 1muF capacitors are available to him, each of which can withstand a potential difference of not more than'400V. Suggests possible arrangement that requires a minimum number of capacitors.

Under what condition will the terminal potential difference be more than the emf of a cell?

Why is the 1st ionisation potential of B less than that of Be ?