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Whole Year Group Deck RGS 3rd Form Physics > 1 Electrostatics and Current > Flashcards

1 Electrostatics and Current Flashcards

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1
Q

When two insulating materials are rubbed together, which particle is transferred between them?

A

An electron** would **transfer from one insulator to the other.

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2
Q

What sort of material does not allow charge to flow through it easily?

A

an insulator such as plastic or wood

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3
Q

A polythene rod is charged by friction and scraped across a nanocoloumbmeter, which charge will the nanocoulombmeter adopt?

A

Nanocoulombmeter becomes negatively charged

Explanation

Electrons transfer from the cloth to the polythene rod. The rod becomes negatively charged

This electrons transfers from the polythene rod to the nanocoulombmeter

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4
Q

Name three uses of electrostatics

A
  1. electrostatic smoke removal from chimneys
  2. photocopier
  3. inkjet printer
  4. electrostatic paint sprayer
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5
Q

Where are neutrons located in an atom?

A

the nucleus

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6
Q

What charge would a rod adopt if 3nC of electrons were transferred from a cloth to the surface of the rod?

A
  • 3 nC
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7
Q

What is an induced charge?

A

When a neutral object has a separation of charge within itself.

Electrons move from one side of the object to the other.

The side with more electrons is negatively charged

The side with fewer electrons is positively charged.

Overall the charge is neutral- charge is only displaced within the object itself

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8
Q

What would happen if two negatively charge balloons were hung side by side?

A

They would repel because like charges repel

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9
Q

What does the prefix nano stand for in 10 nC

A

nano is 10-9

or

10nC = 10 x 10-9 C

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10
Q

What is the definition for current?

A

The rate of flow of charge

OR

The number of coulombs passing a point in a circuit per unit time

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11
Q

Explain why only electrons are transferred when objects are charged by friction.

A

Electrons are located in the outer shells of an atom and are easily removed.

However, protons are located in the nucleus at the centre of the atom and are tightly bound.

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12
Q

What is the current if 100 C passes in 200s ?

A

Q=It

I = Q/t

I = 100 C/ 200 s

I = 0.5 A

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13
Q

A polythene rod is charged by friction and scraped across a nanocoloumbmeter, what charge will the nanocoulombmeter adopt?

A

Nanocoulombmeter becomes negatively charged

Explanation

Polythene gains electron from the cloth to become negatively charged

The electrons transfers from the polythene rod tot the nanocoulombmeter

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14
Q

What does the prefix micro stand for in 100 uA

A

micro is 10-6

or 1

00 uC = 100 x 10-6 C

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15
Q

What is the symbol for an ammeter and how is it connected in the circuit?

A

An ammeter is connected in series

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16
Q

A acetate rod is charged by friction and scraped across a nanocoloumbmeter, what charge will the nanocoulombmeter adopt?

A

Nanocoulombmeter becomes positively charged

Explanation

Acetate loses electron to the cloth to become positively charged

Electrons transfer from the nanocoulombmeter to the rod, leaving the nanocoulombmeter positive.

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17
Q

What does the prefix milli stand for in 65 mA

A

milli is 10-3

or

65 mC = 65 x 10-3 C

18
Q

If 100 A flows for 10 s, how much charge passes?

A

Q= I x t

Q = 100 A x 10 s = 1000 C

19
Q

What equation links charge, current and time?

A

Charge = current x time

Q = It

OR Current = charge / time

I = Q/t

20
Q

I am the rate of flow of charge. What am I?

A

Current

21
Q

What is the current if 1000 C passes in 500s?

A

I = Q/t

I = 1000 C/ 500 s

I = 10C / 5s

I = 2 A

22
Q

Where are protons located in an atom?

A

the nucleus

23
Q

A polythene rod is rubbed with a cloth. What happens?

A

Electrons transfer from the cloth to the rod.

The polythene rod becomes negatively charged

The cloth becomes postively charged

24
Q

Which sort of material allows charge to flow through it?

A

conductor such as a metal

25
Q

What is the relative charge of an electron?

A

-1

26
Q

What charge would a rod adopt if 5nC of electrons were transferred from its surface to a cloth?

A

+ 5 nC

27
Q

What would happen if two positively charge rods were hung side by side?

A

The would repel because like charges repel

28
Q

How can a charged object be discharged?

A

Earth it. Connect a wire conductor from the object to a stake in the ground.

29
Q

What is the relative charge of a proton?

A

+1

30
Q

What is the relative charge of neutron?

A

0

31
Q

An acetate rod is rubbed with a cloth. What happens?

A

Electrons transfer from the rod to the cloth.

The acetate rod becomes positively charged

The cloth becomes negatively charged

32
Q

Where are electrons located in an atom?

A

shells

33
Q

What equation links current, charge and time?

A

Charge = current x time

Q=It

34
Q

What is the current if 1000 C passes in 500s?

A

I = Q/t

I = 1000 C/ 500 s

I = 10C / 5s

I = 2 A

35
Q

What charge would a rod adopt if 5nC of electrons were transferred from its surface to a cloth?

A

+ 5 nC

36
Q

Name three dangers of electrostatic charge

A
  1. Refueling cars or aircraft
  2. explosion of dust or fine powder in industry
  3. Lightning from charge build up in clouds
  4. Spark in operating theatre- explosion of oxygen
37
Q

What can we use to measure charge?

A

A nanocoulombmeter

38
Q

How can we reduce the electrostatic force acting on the objects below?

A

Move them further apart OR decrease their charge.

39
Q

What would happen if a negatively charge rod and a positively charge rod were hung side by side?

A

The would attract because unlike charges repel

40
Q

How can you show that a plastic rod is charged

A

Hold it near small pieces of paper. If it is charge it will attact the small pieces of paper.

Whole Year Group Deck RGS 3rd Form Physics (6 decks)

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