Question 13
A magnetic compass needle is placed in the plane of paper near point A as shown in Figure. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why?

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Solution

When the magnetic field and the direction of current are perpendicular to each other, the deflection is maximum. But when they are in the same plane, no deflection takes place. So, the current carrying conductor needs to be placed in the same plane so that the magnetic compass attains no deflection.

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Q. A magnetic compass needle is placed in the plane of paper near point A as shown in Figure 13.6. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why?

Q. The effect of current causes deflection in a compass needle when it is placed near a current-carrying wire.

Q. What happens to the deflection of the compass needle placed at a point near current-carrying straight conductor, if :
(a) If the current is increased?
(b) If the direction of current in the conductor is reversed?
(c) If the compass is moved away from the conductor?

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)?

The deflection of the needle of a compass when it is placed near a current carrying wire is an example of magnetic effect of electric current.

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