Electrostatic grade 9

What happens when a rubber rod is rubbed with a piece of fur, giving it a negative charge?

• Electrons are added to the rod

• The fur is left neutral

• Electrons are added to the fur

• Protons are removed from the rod

An attracting force occurs between two charged objects when the charges are of....

• equal magnitude

• unequal magnitude

• unlike signs

• like signs

when a glass rod is rubbed with silk and becomes positively charged,....

• protons are removed from the silk

• Protons are added to the silk

• The silk remains neutral

• Electron are removed from the rod

which are the following is the most suitable instrument to detect static electric charge?

• Galvanometer

• Electroscope

• Voltmeter

• Miliameter

The law of electric charges describes how…

• Unlike charges repel each other

• Like charges attract each other

• Like charges repel each other

• Some materials are conductors while others are insulators

Tags

NGSS.MS-PS2-3

If you have built up a static electric charge on your skin, it is likely to discharge when you touch something metal

• True

• False

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

The diagram above shows the electric field near two point charges L and R.

• L = Positive, R = Negative

• L = Negative, R = Positive

• L = Positive, R = Positive

• L = Negative, R = Negative

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Two positive charges with magnitudes 4Q and Q are separated by a distance r. Which of the following statements is true?

• The charge with a greater magnitude exerts a larger force on the small charge

• The charge with a greater magnitude exerts a smaller force on the small charge

• The forces on each charge are the same in magnitude and opposite in direction

• The forces on each charge are the same in magnitude and pointing in the same direction

Tags

NGSS.MS-PS2-5

Sphere A is charged positively and sphere B is neutral. The spheres are brought near each other. Which of the following statements is true?

• There is no electrostatic force between the spheres since one is neutral

• There is a repulsive electrostatic force between the spheres

• There is an attractive electrostatic force between the spheres

• There is a repulsive electrostatic force applied only on sphere B

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A positively charged rod is brought near a charged electroscope. As a result of doing this, the electroscope leaves move closer to each other. What is the charge on the electroscope?

• Positive

• Negative

• It depends on the distance between the electroscope and the rod

• It depends on the material that the electroscope is made of

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5