Which of the following symbols are suitable at places P, Q, and R in the circuit drawn below?

A and B are two identical conducting rods. A is given a positive charge and B is connected to a cell as shown in the figure. Will there be any change in the electrostatic force between A and B if the switch is closed?

With the help of an electroscope, how can we identify the presence and nature of a charge on a body?

Geetha wanted to know the power consumption of all electrical appliances in her house. Help her out in finding it from the data of appliances of her house given below.

Three identical cells E₁, E₂, E₃, and three identical bulbs B₁, B₂, and B₃ are connected as shown in the circuit diagram below. Find how E₁, E_2, E₃, and B₁, B₂, and B₃ are connected, whether in parallel or series?

Three identical cells E₁, E₂, E₃, and three identical bulbs B₁, B₂, and B₃ are connected as shown in the circuit diagram below. Compare the brightness of the bulbs connected to the circuit.

Usually, we use two different types of sockets (a) two-pin socket and (b) three-pin socket. What purpose does the third pin in a three-pin socket serve?

Pranith received an electric bill for April. He started verifying it by calculating the electrical energy consumed by an $2000 \mathrm{W}$ electrical appliance that is used for two hours every day in his workshop. In his house, he used bulbs of $100 \mathrm{W}$ for $4 \mathrm{hours}$ every day in April, which consumes the same electrical energy as that of the electrical appliance in the workshop. Find the number of bulbs Pranith uses in his house.

Find the resultant EMF of the given combination of cells.