# G485

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Coulomb’s Law
The force between two electric charges is proportional to the product of the charges and inversely proportional to the square of the distance between them.
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Electric Field Strength
Force per unit positive charge
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Magnetic Flux Density
A measure of the strength of a magnetic field, defined by:    where B = magnetic flux density (T), I = current in the wire (A), l = length of the wire (m), F = the force experienced (N) and θ = the angle between the wire and the field.
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Tesla
The unit of magnetic flux density, when a wire of length 1m carrying a current of 1A perpendicular to the field experiences a force of 1N.
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Magnetic Flux
The product of magnetic flux density, B and the projection of area, A onto a surface at right angles to the flux. Unit = Weber
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Weber
- One Weber is the unit of magnetic flux when a magnetic field of magnetic flux density 1 Tesla, passes at right angles through an area of 1m2 .
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the product of the magnetic flux and the number of turns on the coil. Unit = Weber turns.
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Faradays Law of E.M. Induction
The magnitude of the induced e.m.f. is equal to the rate at which magnetic flux is cut. For a coil this becomes: The induced e.m.f. is equal to the rate of change of flux linkage.
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Lenz’s Law
The direction of the induced e.m.f. is such that it opposes the change causing it.
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## Other cards in this set

### Card 2

#### Front

Force per unit positive charge

#### Back

Electric Field Strength

### Card 3

#### Front

A measure of the strength of a magnetic field, defined by:    where B = magnetic flux density (T), I = current in the wire (A), l = length of the wire (m), F = the force experienced (N) and θ = the angle between the wire and the field.

### Card 4

#### Front

The unit of magnetic flux density, when a wire of length 1m carrying a current of 1A perpendicular to the field experiences a force of 1N.

### Card 5

#### Front

The product of magnetic flux density, B and the projection of area, A onto a surface at right angles to the flux. Unit = Weber

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