Question

Write the Area of a Quadrant of a circle of radius r.​

Answer 1

Answer:

We know the angle subtended by the quadrant of a circle at the centre is π2 . So, the area of the quadrant will be equal to π22π×πr2=π4ππr2=πr24 . Hence, the area of the quadrant of a circle having radius r is equal to πr24 .

Step-by-step explanation:

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Answer 2

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An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil.