Mira did an investigation on how the number of coils around an electromagnet affected the number of paper-clips it picked up. She collected some results as shown in the given table. Number of coils Number of paper clips picked up 0 0 5 1 10 3 15 3 20 8 25 12 Plot a line of best fit on your graph but don't include the anomalous result.

The strength of the electromagnet can be changed by changing the number of turns in the coil and the current passing through the coil. Increasing the number of turns in the coil increases the strength of the magnetic field. Here in the given table as the number of turn in the coils increases from 10 to 15 but the number of paper clips picked up are remains same. Hence, 15 - 3 is the anomalous result of the given table. The graph without anomalous result is shown below. The blue line represents the given results and the red line represents the average with 2 clips for each 5 turns in a coil.

EASY

Lower Secondary Stage 8

IMPORTANT

Earn 100

Use the field lines to predict what the magnets would do if allowed to move freely.

Important Questions on Magnets

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 10 - Magnets>Exercise 6>Q 1

Describe how an electromagnet is different from a permanent magnet.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 10 - Magnets>Exercise 6>Q 2

Tariq needs to choose a core for his electromagnet. He has iron, copper, plastic and wood. Which material would you recommend? Why?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 10 - Magnets>Exercise 6>Q 3

You can change the strength of an electromagnet. Explain why this is useful.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 10 - Magnets>Exercise 8>Q 4

Mira did an investigation on how the number of coils around an electromagnet affected the number of paper-clips it picked up. She collected some results as shown in the given table.

Number of coils	Number of paper clips picked up
$0$	$0$
$5$	$1$
$10$	$3$
$15$	$3$
$20$	$8$
$25$	$12$

One of the result is anomalous. Which one?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 10 - Magnets>Exercise 8>Q 4

Mira did an investigation on how the number of coils around an electromagnet affected the number of paper-clips it picked up. She collected some results as shown in the given table.

Number of coils	Number of paper clips picked up
$0$	$0$
$5$	$1$
$10$	$3$
$15$	$3$
$20$	$8$
$25$	$12$

Plot a line of best fit on your graph but don't include the anomalous result.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 10 - Magnets>Exercise 8>Q 4

Mira did an investigation on how the number of coils around an electromagnet affected the number of paper-clips it picked up. She collected some results as shown in the given table.

Number of coils	Number of paper clips picked up
$0$	$0$
$5$	$1$
$10$	$3$
$15$	$3$
$20$	$8$
$25$	$12$

What conclusions can Mira draw from the results?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 10 - Magnets>Exercise 8>Q 5

Lee changed both the number of coils and the current when he did his investigation. When he increased them both, he picked up more paperclips. Why can't he conclude that the number of coils affects the strength of the electromagnet.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 10 - Magnets>Exercise 9>Q 6

Why can't you make an electric bell using a permanent magnet?

Use the field lines to predict what the magnets would do if allowed to move freely.

Important Questions on Magnets

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