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13. Magnetic Effects of Electric Current
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Q5 of 47 Page 406

A magnet AB is broken into two pieces. Point out the polarity of A,B,C and D.

When the magnet AB is broken into pieces as shown in the figure below.


Polarity of A and C is north


Polarity of B and D is south


Because single poles of magnet do not exist when the magnet is broken the two poles (north and south) are created immediately.


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3

The diagram shows a coil of wire wound on a soft iron core forming an electromagnet. A current is passed through the coil in the direction indicated by the arrows. Mark the N and S-poles produced in the iron core.

4

Why is an alternating current considered to be advantageous over direct current for long range transmission of electric energy.

6

The diagram shows a beam of electrons about to enter a magnetic field. The direction of the field is into the page. What will be the direction of the deflection, if any beam passes through the field?

7

A small valued resistance XY is connected across the ends of a coil. Predict the direction of induced current in the resistance XY when


(i) South pole of a magnet moves towards end A of the coil.


(ii) South pole of a magnet moves away from end A of the coil.

Questions · 47
13. Magnetic Effects of Electric Current
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