Van der Graaff

Hair attracted to the balloon because

• Different electrical charges between them repel

• Different charge between them attract

• Same electrical charge between them attract

His hairs stand straight because

• Sweat from hair evaporates to water vapour

• Same charge between hairs repel

• Hairs and boy's body has different charges

You walk across a shag carpet and become negatively charged. You became negatively charged because...

• Protons from your body traveled to the carpet and therefore you became negatively charged

• Protons from the carpet traveled to your body and therefore you became negatively charged

• Electrons from your body traveled to the carpet and therefore you became negatively charged

• Electrons from the carpet traveled to your body and therefore you became negatively charged.

A glass rod becomes positively charged when it is rubbed with silk. This is because the glass rod

• gains protons

• loses protons

• gains electrons

• loses electrons

Identify the image presented in the screen and it is the smallest unit of Matter.

Which of the following materials that is not a good electrical conductor?

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• 
• 
• 

If something loses electrons it becomes...

• Positively charged (+)

• Negatively charged (-)

• Neutral

• Uncharged

If something gains electrons it becomes...

• Positively charged (+)

• Negatively charged (-)

• Neutral

• Uncharged

When you brush your hair you scrape off electrons, and your hair

• becomes positively charged
• becomes negatively charged
• becomes positively and negatively charged
• remains uncharged, or neutral

When a negatively charged balloon is brought close to a wall, the positive charges in the wall are

• attracted to the balloon

• repelled from the balloon

• do not affect the balloon

• neutralized