Q. Following of these are circuits used for full-wave rectification,
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 36  98 Semiconductor Electronics: Materials Devices and Simple Circuits Report Error

Solution:

The circuit using two diodes gives output rectified voltage corresponding to both the positive as well as negative half of the AC cycle.
Hence, it is known as full-wave rectifier. There is another circuit of full-wave rectifier which does not need a centre tap transformer but needs four diodes. It is called a bridge rectifier.