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Question

A transformer is a device which can change the ______ of the induced alternating voltage.

A
number of coils
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B
direction
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C
magnitude
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D
phase
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Solution

The correct option is C magnitude
A transformer is a device capable of changing the magnitude of the alternative e.m.f. (voltage) by the changing current flow through its coils. A step-up type of transformer increases the magnitude of the voltage through it, whereas a step-down type decreases the magnitude.

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