If magnetic needle does not deflect, and LED or bulb also does not glow while testing a solution for electrical conductivity, it might imply:
Solution is an insulator
Solution is a poor conductor
The circuit is broken
All of the above
If none of the testers work, all of the above might be the reasons for this.
If LED glows but bulb does not glow while testing a liquid for passage of electric current, it might mean
A set up consisting of a bulb, salt solution and a magnetic compass is arranged in such a manner that bulb and salt solution come in between the electric wires connected to the cell and hence complete the circuit. The magnetic compass is wrapped with the connecting wires. When switched on, current flows through the salt solution, the bulb glows and the needle deflects. Which of the following effects of current is responsible for this?
A set up consisting of a bulb, salt solution and a magnetic compass is arranged in such a manner that bulb and salt solution come in between the electric wires connected to the cell and hence complete the circuit, magnetic compass is wrapped with the connecting wires. When switched on, current flows through salt solution, the bulb glows and the needle deflects. Which of the following effects of current is observed?