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Arlecino [84]
2 years ago
7

How does earths atmispher help it to sustain life

Physics
1 answer:
azamat2 years ago
7 0
First of all you spelled atmosphere wrong and 2 it sustains life by keeping the oxygen produced by the plants on earth for the humans and plants and animals to breath.
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If the primary of a transformer were connected to a dc power source,
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Answer:

D. only briefly while being connected or disconnected.

Explanation:

As we know that transformer works on the principle of mutual inductance

here we know that as per the principle of mutual inductance when flux linked with the primary coil charges then it will induce EMF in secondary coil

So here when AC source is connected with primary coil then it will give output across secondary coil because AC source will have change in flux with time.

Now when we connect DC source across primary coil then it will not induce any EMF across secondary coil because DC source is a constant voltage source in which flux will remain constant always

So here in DC source the EMF will only induce at the time of connection or disconnection when flux will change in it while rest of the time it will give ZERO output

so correct answer will be

D. only briefly while being connected or disconnected.

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