Science
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
Answer
The deflection of the magnetic needle can be explained by the flow of current through the wounded wire of the tester. When the free ends of a tester are dipped into a solution, the circuit becomes complete and current starts flowing through the solution proving that the solution is a good conductor of electricity. The current then flows through the wire creating a magnetic field that deflects the magnetic needle.
Related Questions
Fill in the blanks.
(a) Most liquids that conduct electricity are solutions of ……………, …………… and ……………
(b) The passage of an electric current through a solution causes …………… effects.
(c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the …………… terminal of the battery.
(d) The process of depositing a layer of any desired metal on another material by means of electricity is called ……………
Name three liquids, which when tested in the manner shown in Fig.11.9, may cause the magnetic needle to deflect.
The bulb does not glow in the setup shown in Fig.11.10. List the possible reasons. Explain your answer.
A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A, while it glows very dimly for liquid B. You would conclude that
- liquid A is a better conductor than liquid B.
- liquid B is a better conductor than liquid A.
- both liquids are equally conducting.
- conducting properties of liquid cannot be compared in this manner.