# When will electromagnet attracts magnetic objects?

a. when current flows in the wire

b. when there is no current in the wire

c. when there is iron core in the wire

d. when a compass is placed near the magnet

Answers: 1

## Answers

When will electromagnet attracts magnetic objects? a. when current flows in the wire b. when there...

c. when there is iron core in the wire

. more

2. lesser and more

3. more and lesser

4. more and lesser

5. lesser

Explanation:

1. The current is directly proportional to the voltage and inversely proportional to the resistance. So doubling or tripling it will cause the current to be one-half or one-third the original value. In a linear circuit of fixed resistance, if we increase the voltage, the current goes up, and similarly, if we decrease the voltage, the current goes down. This means that if the voltage is high, so is the current, and if the voltage is low, so is the current...

answer:

1.If you are doubling the current, either you are doing it by increasing the voltage or by decreasing the resistance or by a combination of both. So the resistance will remain constant if current is doubled through doubling the voltage supply.

2.By Ohm's law, V = IR. Current will decrease when voltage decrease, and will do so by a constant proportion. ... And if water's pressure drops, by keeping constant the pipeline diammeter (resistance), then water current will drop too.

Explanation:

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answer:

10

Explanation:

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answer:

Electricity electricity electricity electricity

Explanation:

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answer:

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Explanation:

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B.

Explanation:

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