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Q.

What are the methods that can produce a magnetic field?


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a

Circular coil carrying current

b

Straight wire carrying current

c

Both 1 and 2

d

None 

answer is C.

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Detailed Solution

A circular coil carrying current and a straight wire carrying current can both produce a magnetic field.
When a coil is not near the magnet, relative motion is generated between the coil and the magnet by either moving the magnet or the coil, this produces EMF (Electromotive force), and electric current is generated. So, a circular coil carrying current and a straight wire carrying current can produce a magnetic field.
 
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