A transformer has $200$ turns in primary coil and $600$ turns in secondary coil. If a $220 V$ $D C$ is applied across the primary coil, what will be the voltage across the secondary coil.

\frac{220}{3} V

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660 V

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Zero

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220 V

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Solution

The correct option is C $Zero$
On applying a $D C$ voltage in the primary coil, no flux variation takes place in the core of the transformer,i.e,

$ϕ = constant$

$\Rightarrow \frac{d ϕ}{d t} = 0$

$∴ E_{i n d u c e d} = 0$

So, no emf will be induced in the secondary coil.

Hence, option $(C)$ is correct.

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A transformer has 200 turns in primary coil and 600 turns in secondary coil. If a 220 V DC is applied across the primary coil, what will be the voltage across the secondary coil.

The correct option is C ZeroOn applying a DC voltage in the primary coil, no flux variation takes place in the core of the transformer,i.e, ϕ=constant ⇒dϕdt=0 ∴Einduced=0 So, no emf will be induced in the secondary coil. Hence, option (C) is correct.

A transformer has $200$ turns in primary coil and $600$ turns in secondary coil. If a $220 V$ $D C$ is applied across the primary coil, what will be the voltage across the secondary coil.