Electric fields

Question 1

Electric field strength

Answer 1

Force (of attraction) per unit positive charge

The electric flux per unit perpendicular area.

Question 2

Fleming’s left-hand rule

Answer 2

The rule used to predict the direction of the force experienced by a current-carrying conductor placed in an external magnetic field.
T -> F (force), FF -> B (magnetic field), SF -> I (current)

Question 3

Magnetic flux density

Answer 3

B = F/IL
B, magnetic flux density. F is the force on a conductor of length L carrying a current I at right angles to the magnetic field.
Units: Tesla

Question 4

Tesla

Answer 4

The strength of a magnetic field that will produce a force of 1N on a current of 1A in a wire of length 1m at right angles to a magnetic field.

Question 5

Magnetic flux

Answer 5

The product of magnetic flux density normal to a circuit and the cross-sectional area of the circuit.

Question 6

Weber

Answer 6

The magnetic flux of a field of strength 1 Tesla through a circuit of area 1m^2

Question 7

Magnetic flux linkage

Answer 7

The product of magnetic flux and number of turns on a coil

Question 8

Faraday’s law of electromagnetic induction

Answer 8

The magnitude of induced emf in a circuit loop equals the rate of change of magnetic flux linkage

Question 9

Lenz’s law

Answer 9

The induced emf is in a direction that opposes the change producing it

Question 10

Electric potential

Answer 10

The energy needed to bring a unit point charge from infinity to a given location.