GEOLOGY

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EARTH SCIENCE

MAGNETISM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A group of students conducted an activity for science class. They used a galvanometer, which is an instrument that can detect an electric current. They followed these steps:1. Obtain a 100 foot long electrical extension cord. 2. Connect each end of the extension cord to the galvanometer. 3. Using duct tape, secure part of the extension cord to the ground as shown below. 4. Swing the top part of the extension cord as if a person were to enter to jump rope. 5. Have a student observe the galvanometer while the cord is rotating. Students observed that the needle of the galvanometer moves. What does this demonstrate?
A
Moving an electrical conductor through Earth’s magnetic field induces an electric current.
B
Moving an electrical conducting wire close to the ground changes Earth’s magnetic field.
C
Moving an electrical conducting wire through a magnetic field changes the wire’s conductivity.
D
Moving an electrical conductor next to an electric current produces a magnetic field.
Explanation: 

Detailed explanation-1: -A magnet is brought near a conducting loop along its axis Because the magnetic field associated with the loop increases so the magnetic flux linked with the loop also increases. So in this case the magnetic flux is changing, hence an electric current will generate. Hence, option 1 is correct.

Detailed explanation-2: -Thus, the magnetic effect of electric current is defined as the electromagnetic effect. Which means that if a magnetic compass is brought near a electrically charged conductor then the needle of this compass gets deflected because of the flow of electricity.

Detailed explanation-3: -Class 12: Magnetic Effect of Electric Current-Part 1 | NCERT Ch 4 | Physics | Vinod Kumar-YouTube.

Detailed explanation-4: -the magnetic field increases when current in the wire of electromagnet increases.

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