A charge of one coulomb liberates 0.0033g of copper in an electrolytic process. How long will it take a current of 2A to liberate 1.98g of copper in such a process?

In which of the following situations is photoelectric effect employed?

I. Automatic devices for switching on light at dusk
II. Automatic doors in departmental stores
III. Automatic devices for switching stores
IV. Automatic voltage stabilization

It has a much longer life than lead-acid accumulator

Which of the following statements is not an advantage of an alkaline accumulator?

To protect a material from the influence of an external magnetic field, the material should be kept in a

Physics