Advertisements
Advertisements
प्रश्न
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
Advertisements
उत्तर
When the free ends of a tester are dipped in a solution, the magnetic needle deflects. This happens because electric current is flowing through the tester. When its free ends are dipped in the solution, due to the flow of this electric current, a magnetic effect is generated in the magnetic needle, as a result of which the magnetic needle starts deflecting.
APPEARS IN
संबंधित प्रश्न
Most liquids that conduct electricity are solutions of ________, _______ and ________.
The bulb does not glow in the setup shown in figure 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 ______.
Does pure water conduct electricity? If not, what can we do to make it conducting?
In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.
A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.
Which one of the following solutions will not conduct electricity?
Observe the following circuit given in the figure.
Current does not flow in the circuit, if there is a gap between the two wires. Does it indicate that air is a poor conductor of electricity? Does air never conduct electricity? Explain.
Boojho made the circuit as shown in the figure. He wanted to observe what happens when an electric current is passed through water. But he forgot to add a few drops of lemon juice to water. Will it make any difference to his observations? Explain.
