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Math Expression Evaluation and Text Analysis

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Math Expression Evaluation and Text Analysis

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Questions and Answers

What is the result of the expression $2 + (16-17) - 4 + 3$?

What is the variable name in the given text?

Aladi

What is the revision number mentioned in the text?

How many digits are in the number mentioned in the text as '1111'?

4 Signup and view all the answers

Write the number '5' in words.

Five Signup and view all the answers

Explain how the strength of an electromagnet can be increased according to the text.

By increasing the current or the number of turns in the coil. Signup and view all the answers

Describe how the polarity of an electromagnet can be changed.

By changing the direction of the current flowing through the coil. Signup and view all the answers

What is the difference between an electromagnet and a permanent magnet when it comes to working without electric current?

An electromagnet loses its magnetism when the current stops flowing, while a permanent magnet does not need electric current to work. Signup and view all the answers

Define magnetic induction as explained in the text.

Magnetic induction is the phenomenon where a piece of steel or iron behaves like a magnet when near a strong magnet. Signup and view all the answers

What are induced magnetic poles in the context of iron or steel near a strong magnet?

Induced magnetic poles are the magnetic poles formed at the ends of iron or steel when placed near a strong bar magnet. Signup and view all the answers

Explain why two common pins attached to the pole of a bar magnet diverge outward and converge inward when attached to each end of a horse-shoe magnet.

The pins diverge in the bar magnet case because they acquire similar poles, while they converge in the horse-shoe magnet case due to acquiring opposite poles. Signup and view all the answers