Q20 of 72 Page 13

What is the cause of earth's magnetism?

Earth's magnetism is due to the magnetic effect of current which is flowing in the liquid core at the center of the earth.

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18 Explain why, two magnetic lines of force do not intersect. 19 State the right hand thumb rule. 21 How will you find out the direction of the magnetic field produced by current-carrying conductor? 22 What type of core should be put inside a current-carrying solenoid to make an electromagnet?