Two coils having 30 and 600 turns respectively are wound side by side on a closed iron circuit of cross-section 100 cm^2 and of mean length of 150 cm. A current in the first coil grows steadily from zero to 10 A in 0.01 second. Find the emf induced in the coil. Relative permeability of iron is 2,000 a. 209.4 V b. 301.6 V c. 299.3 V d. 300.9 V

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Magnetically Coupled Circuit

When two loops of a circuit with or without any physical contact affect each other with the help of magnetic fields, the circuits are said to be magnetically coupled. Magnetically coupled circuits are important parameters in electrical engineering. The most common example of a magnetically coupled circuit is a transformer. The transformer is a device used to transfer electric energy from one circuit to another. The primary winding and secondary winding are the main elements of a transformer. The primary winding creates varying magnetic flux and the secondary winding induces the electromotive force due to the effect of magnetic flux created by the primary winding.