Donald Duck conducted an experiment to test the conductivity of two liquids A and B by using a tester with magnetic needle. Current was passed through both the liquids and it was found that the magnetic needle deflected more in case of Liquid B. Which among these is a poorer conductor and why? [2 MARKS]

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Solution

Reason : 1 Mark
Explanation : 1 Mark

The magnetic needle deflects because of the magnetic effect of current. Greater the current, more will be the deflection. Greater current implies more conductivity of the solution. So liquid A is a poorer conductor of electricity.

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Donald Duck conducted experiment to test the conductivity of two liquids A and B by using the tester with magnetic needle. Current is passed through both the liquids and it is found that magnetic needle deflected more in case of Liquid B. Which among these liquids is a poor conductor and why?

Q. Fill in the blanks in the following passage(s) from the words given inside the box.

magnet, carrying magnetic effect, electricity, the magnitude of current deflection increases, eastwards, southwards.
Oersted was the first to put forth the direct relation between _______ and magnetism. He conducted several experiments to determine the _______ of a current _______ wire. The following describes the Oersted experiment conducted to establish that a current carrying wire acts as a _______.
A long straight wire is connected to an external battery and an electric current is passed through it. When a magnetic needle is placed below the wire such that the wire is parallel to the axis of the magnetic needle and the current flows in the south to north direction, a deflection in the needle is observed. It is observed that the north pole of the needle is deflected westwards and as the _______ is increased, the deflection, _______ till the north pole of the needle turns towards exact west. It is also observed that if instead of placing the magnetic needle below the wire, if it was placed above the wire, the north pole of the magnetic needle is deflected _______ .

Why is a magnetic needle used in the tester made to test mostly weak conductors? [3 MARKS]

A magnetic needle which is kept near a conductor gets deflected when current is passed through the conductor.

Question 5
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
(i) liquid A is a better conductor than liquid B.
(ii) liquid B is a better conductor than liquid A.
(iii) both liquids are equally conducting.
(iv) conducting properties of liquid cannot be compared in this manner.

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Reason : 1 Mark Explanation : 1 Mark The magnetic needle deflects because of the magnetic effect of current. Greater the current, more will be the deflection. Greater current implies more conductivity of the solution. So liquid A is a poorer conductor of electricity.

Reason : 1 Mark
Explanation : 1 Mark

The magnetic needle deflects because of the magnetic effect of current. Greater the current, more will be the deflection. Greater current implies more conductivity of the solution. So liquid A is a poorer conductor of electricity.