# Physics

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How do Electrons become charged when rubbing together ?
Electrons can move from one substance to another when objects are rubbed together. When you rub two different materials against each other, they become electrically charged
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Factor that affects the strength of an electromagnet
WIRE SIZE - Using larger gauges of wire on the coil will decrease this innate resistance. This will increase the current and therefore the field. Using smaller gauges will increase the resistance, reduce the current and weaken the field.
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Factor that affects the strength of an electromagnet
BATTERY VOLTAGE - The higher the voltage of the battery, the more current will flow through the coil. The greater the current in the coil, the stronger the magnetic field will grow. lowering the battery voltage decreases the current =weakening field
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Factor that affects the strength of an electromagnet
METAL CORE - he metal inside the coil magnifies the field created by it. Changing the metal core for a different metal will make the electromagnet stronger or weaker
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Factor that affects the strength of an electromagnet
No. OF LOOPS- One way to increase or decrease the strength of the magnetic field is to change the number of loops in the coil. The more loops you add, the stronger the field will become. The more loops you remove, the weaker the field will become.
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Formula for Voltage
I (current)x R (resistance)
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Formula for Current
V (voltage) divided by R (resistance)
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Formula for Resistance
V (voltage) divided by I (current)
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Charge of polythene rod
f you take a piece of polythene and rub it with a duster, the polythene becomes charged negatively. The duster becomes positively charged
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Charge of acetate rod
When an acetate rod is rubbed with a duster, electrons are transferred from the rod onto the duster, making the rod positively charged
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## Other cards in this set

### Card 2

#### Front

Factor that affects the strength of an electromagnet

#### Back

WIRE SIZE - Using larger gauges of wire on the coil will decrease this innate resistance. This will increase the current and therefore the field. Using smaller gauges will increase the resistance, reduce the current and weaken the field.

### Card 3

#### Front

Factor that affects the strength of an electromagnet

### Card 4

#### Front

Factor that affects the strength of an electromagnet

### Card 5

#### Front

Factor that affects the strength of an electromagnet