Physics Past Questions and Answers

A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.

In the circuit above R is a resistor whose resistance increases with increases with increase in temperature L₁ and L₂ are identical lamps. If the temperature of R increases

A house is supplied with a 240V a.c mains. To operate a door bell rated at 8v, a transformer is used if the number of turns in the primary coil of the transformer is 900. calculate the number of turns in the secondary coil of the transformer

The diagram above shows a current carrying wire between the poles of a magnet. In which direction would the wire tend to move?

An induction coil is generally used to