HARD
7th CBSE
IMPORTANT
Earn 100

When connected as shown, the bulb glows, but dimly. Which of these CAN be the explanation for this:

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Important Questions on Electric Current and Its Effects

HARD
7th CBSE
IMPORTANT

Instead of a soft iron core, if we wind a current-carrying wire around a wooden pencil, would it still deflect a magnetic compass needle?

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HARD
7th CBSE
IMPORTANT

The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow? Give reason to your answer

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HARD
7th CBSE
IMPORTANT
You are given a U shaped soft iron piece, insulated copper wire and a battery. How can it be used to make a horse shoe electromagnet?
HARD
7th CBSE
IMPORTANT

State whether the statement is true or false. Correct it if the statement is false.

In an electric bell, the hammer strikes the gong because the gong is magnetic.

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HARD
7th CBSE
IMPORTANT

Give one word for the following.

The part of an electric bell that is attracted to the electromagnet when switched on is _____.(soft iron strip/hammer)