Electricity And Magnetism

Question 0

…. Always move in a direction that will increase their potential

Answer 0

Electrons

Question 1

Materials that contain many electrons inside theme

Answer 1

Conductors

Question 2

Charges in coulomb law are assumed to be

Answer 2

Point charges

Question 3

Force per unit charge experienced by a small positive test charge

Answer 3

Electric field

Question 4

The electric field inside any conducting body is … Because of situations in which charge does not move

Answer 4

Zero

Question 5

…. Charge electric field lines are directed into the charge

Answer 5

Negative

Question 6

An … Has constant magnitude and direction

Answer 6

Uniform

Question 7

An electric charge creates an electric field and an …. Around it

Answer 7

Electric potential

Question 8

The … At a point is the work per unit charge that must be done to bring the positive test charge from away to the point of interest

Answer 8

Potential

Question 9

Electric field between parallel lines can be defined as

Answer 9

E=V/d, where V is potential difference and d is the separation

Question 10

The work done when a charge equal to 1e is taken across a potential difference of 1 volt

Answer 10

Electron volt

Question 11

A moving charge creates an

Answer 11

Electric current

Question 12

The presence of an electric field inside a conductor forces electrons to accelerate in a direction opposite to the field (why?) and this orderly motion of the electrons in the same direction is what makes electric current

Answer 12

The charge of the electron is negative

Question 13

… Lose energy constantly, which…. Pick about. These will vibrate about their equilibrium positions, which will increase the temperature of the material

Answer 13

Electrons / atoms of the material

Question 14

An electric current is produced when a wire is heated so that it begins to emit electrons

Answer 14

Thermionic emission

Question 15

Potential difference across its ends, divided by the current flowing through it

Answer 15

Electric resistance

Question 16

When the temperature of a metallic conductor is kept constant, the current through it is proportional to the potential difference across it

Answer 16

Ohm’s law

Question 17

The… Of a wire is proportional to its length L and inversely proportional to the cross sectional area A

Answer 17

Resistance

Question 18

If a current flows through a resistor, then there must be a potential difference across the ends of that resistor. A resistor is thus said to

Answer 18

Drop the potential

Question 19

In a battery, work must be done on the electrons to push them from the positive to the negative terminal. The ratio of work done by non electrical forces to a quantity of charge q that moves from one terminal to the other is the

Answer 19

Emf of the battery

Question 20

An … Measures the current in the resistor connected in series to it

Answer 20

Ammeter

Question 21

Measures the potential difference across a resistor it is connected parallel to

Answer 21

Voltmeter

Question 22

The fact that the magnetic force on a charge is always normal to the velocity means that the path of a charge in a magnetic field must be

Answer 22

Circular or helical

Question 23

The magnitude of the magnetic field B created by a current in a wire varies linearly with the current in the wire and inversely with the perpendicular distance from the wire

Answer 23

Orsted

Question 24

The constant of proportionality between magnitude of magnetic field, current and distance is

Answer 24

Magnetic permeability of vacuum

Question 25

Forces are attractive in

Answer 25

Parallel currents

Question 26

Forces are repulsive in

Answer 26

Antiparallel currents

Question 27

Magnetic forces must be equal in magnitude even though the magnetic fields are different

Answer 27

Newton 3