An electric current passes through a straight wire in the direction of south to north. Magnetic compasses are placed at points A and B as shown in the figure.
What is your observation?

The needle will not deflect

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Only one of the needles will deflect

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Both the needles will deflect in the same direction

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Both the needles will deflect in the opposite directions

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Solution

The correct option is D Both the needles will deflect in the opposite directions
Magnetic compass needle shows deflection in the direction of magnetic field lines. We know that the points A and B has magnetic field lines in opposite direction, thus the needle of the compass will deflect in the opposite direction.

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Similar questions

Q. Which of the following observations are true for Hans Oersteds experiment?
a. When current passes through the wire the compass needle comes to rest in a direction along the Earths magnetic field.
b. When placed just above the wire, North Pole of the compass needle deflects towards the east when current is passes from A to B.
c. When placed just below the wire, North Pole of the compass needle deflects towards the east when current is passes from B to A i.e. on reversing the direction of current

Q. An electric current passes through a straight wire from south to north direction. Magnetic compasses are placed at points A and B as shown in the figure:

What is your observation?

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.
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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 _______ .

Electricity and magnetism are said to be inter-related to each other. A current carrying conductor has a magnetic field around it. So, when a compass is brought near to it, we can observe a deflection in the compass. Similarly, a battery is the source of the electric current. What will be the deflection, when we bring a compass near a 3 V cell (battery)?

Why does a compass needle get deflected when placed in a magnetic field? is it because the north pole of the compass needle and north pole of the magnet deflect?

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An electric current passes through a straight wire in the direction of south to north. Magnetic compasses are placed at points A and B as shown in the figure.What is your observation?

An electric current passes through a straight wire in the direction of south to north. Magnetic compasses are placed at points A and B as shown in the figure.
What is your observation?