A student staying in a coastal area tests the drinking water tests the drinking water and thesea water with a circuit in which a part of the connecting wire is wound around a matchboxcontaining compass.(a) In which of the above case will the compass needle show more deflection?(b) Give suitable reason for your answer.

A student 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. Which of the following is the correct reason?Options:Seawater contains more dissolved salts as compared to drinking water.​Seawater contains less dissolved salts as compared to drinking water.​Seawater is a source of naturally occurring elements.​Seawater contains many aquatic organisms.​

A student is playing with a magnetic compass near a bar magnet. At a range of 10 cm, they notice that the compass needle is pulled slightly towards the magnet. What would they see if the compass was moved to 8 cm? The needle would not move from its original deflection. The needle would be pushed in the opposite direction. The needle would be pulled more towards the magnet. The needle would return closer to its normal position.

A simple circuit consists of a battery, wire, bulb, and switch. When the switch is on, a small magnetic compass is placed near the circuit and shows a slight deflection to the west. What causes the deflection? The compass is responding to the current because it was made of copper. The current moving through the circuits causes a local magnetic field. The electricity from the wire was arcing to the compass needle. The charges in the compass's needle is flowing with current in the wire.

A compass needle is a small magnet on a pivot. The needle can swing around freely.Explain why one end of the needle points north.

In your own words, explain why the moving compass needle proved there was a magnetic field around the electric current.