Electromagnetism

Magnetic Field

1

What happens when two magnets with opposite poles are brought close together?

They attract each other. / attraction / attractive force

2

What happens when two magnets with the same poles face each other?

They repel each other. /repulsion

3

Materials that allow electrical energy to pass through.

Conductors

4

The light bulb has a intensity of 15 candela (cd) and a distance (radius) of 7m. Use the inverse square law to calculate the magnitude of electromagnetic radiation. (Illuminance) 

0.31 Lux

5

What is the value of the coulomb's constant? 

9 x 10⁹ / 8.987 x 10⁹

Magnetic Field

1

WHat is the unit of charge? 

Coulomb

2

What is the rule for drawing magnetic field lines around a magnet?

They go from the north pole to the south pole.

3

Materials that can become magnetized when in the presence of a permanent magnet. 

Ferromagnetic 

4

The mass of the first object is 50 kg, and the mass of the second object is 20 kg with a distance 2 m apart. What is the F = (Universal Gravitational Force)?

1.6675 x 10^-8 N(m/kg)²

5

A positive point charge has a charge of +3 microcoulombs. What is the field strength of this point charge at the distance of 3m?    

3000

Magnetic and Electric Field

1

Region around magnetic material which the force of magnetism acts.

Magnetic Field

2

Region around a charged particle.

Electric Field

3

What is the value of the gravitational constant? 

6.67 x 10^-11 

4

What is the unit of intensity of light? (the light source)

candela

5

Two balloons holding -9 microcoulombs (10^-6)

of charge are separated by 0.25 meters. How much force do they have? 

11.65 N

Electrical Energy

1

Form of energy associated with charged particles due to their positions and motion in an electric field.

Electrical Energy

2

Closed loop through which charge can move continuously.

Electric circuit

3

Electric current flows in one direction only.

Direct Current (DC)

4

Find the voltage in a circuit with a current of 15 amps and a resistance of 9 ohms.

135 V

5

Difficulty in passing an electric current through an object is a measure of the object's electrical resistance. What do you call the object we use to control the flow of electric current? 

Resistor

Electrical Energy

1

Unit of electrical energy

(J)

2

The rate at which charge moves through this cross section

Electric current

3

What is the formula for ohm's law? 

V = IR

4

Find the resistance in a circuit with a voltage of 9 volts and current of 2.5 amps.

3.6 ohms

5

What is the magnitude of electric current if the circuit has a resistance of 15 ohms and voltage of 1.5 V?

0.1 amperes / 0.1 amps