The gravitational field strength at any point is the force acting on a small test mass per unit mass at that point in a gravitational field.
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Define Newtons Law of Gravitation
The gravitational force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the separation of their centres of mass
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Gravitational Potential
The work done per unit mass in moving a small test mass from infinity to that point in a gravitational field
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Define a Magnetic Field
A region where a force is exerted on magnetic materials.
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Define the force on a wire
The force is proportional to the magnetic field strength.
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Magnetic Field Strength
The force on one metre of wire carrying a current of one amp at right angles to the magnetic field.
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Define Magnetic Flux Density
A measure of the strength of the magnetic field per unit area.
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Define Magnetic Flux Linkage
When an e.m.f is induced by changing thee magnitude or direction of the magnetic flux.
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Define the change in Magnetic Flux
A change in flux of one weber per second will induce an e.m.f of one volt in a loop of wire.
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State Faraday's Law
The induced e.m.f is directly proportional to the rate of change of flux linkage.
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State Lenz's Law
he induced e.m.f is always in such a direction as to oppose the change that caused it.
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Define Electric Field Strength
The electric field strength at any point is the force per unit charge acting on a small positive test charge at that point.
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Define Electric Potential
The work done per unit charge on a small positive charge in moving the charge from infinity to the point.
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Other cards in this set
Card 2
Front
Define Newtons Law of Gravitation
Back
The gravitational force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the separation of their centres of mass
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