Explain why the primary current in the a.c. transformer increases when the secondary coil is connected to the load?

Explain why the primary current in the a.c. transformer increases when the secondary coil is connected to the load? 

When a load is connected to the secondary, current flows in the secondary which induces magnetic flux in the core in opposition to magnetic flux due to primary current.

Magnetic flux in the core due to primary current thus reduces.

This leads to a reduction in back e.m.f in the primary and hence the primary current increases.

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