Assertion : A metallic surface is moved in and out in magnetic field then emf is induced in it.

Reason : Eddy current will be produced in a metallic surface moving in and out of magnetic field.

A system $$S$$ consists of two coils $$A$$ and $$B$$. The coil $$A$$ carries a steady current $$I$$. While the coil $$B$$ is suspended nearby as shown in figure. Now, if the system is heated, so as to raise the temperature of two coils steadily, then

A circular loop of radius 0.3 cm lies parallel to a much bigger circular loop of radius 20 cm. The centre of the small loop on the axis of the bigger loop. The distance between their centres is 15 cm. If a current of 20 A flows through the smaller loop, then the flux linked with bigger drop is