electric forces and fields
How do you draw field lines of a proton
lines with arrows going away from proton
What are 3 ways to increase resistance?
1) increase temperature
2) decrease circumference
3)longer wire
4)material
What stays constant in a series circuit?
current
What is a magnetic domain?
a region where group of atoms spins are aligned in the same direction.
If the restoring force is proportional the displacement from equilibrium, the object is in
How does the electric force compare with gravitational force?
It is much stronger
If we push a proton near another proton how will electric potential change?
It will increase
what stays constant in a parallel circuit?
voltage
If a current is coming towards you, which way is the magnetic field oriented?
counterclockwise
How can we increase the period of pendulum?
make the string longer, go to low gravity planet.
If you double the charge of an object, how does it affect electric force?
It increases by 2x
a 1050 W toaster operates on 120 V. What is the resistance?
14 ohms
If we have a voltage of 9V and a 3,5, 8 and 2 ohm resistor, what is the current?
0.50 A
If a proton is moving in the same direction of the magnetic field, how will the magnetic force change?
It will be zero
If a wave comes to a fixed in, how will it reflect back?
inverted
If you double distance, how would it affect electric force
force reduced by 1/4
How do power lines distribute power in terms of I and V.
low I, high V
A 4ohm, 8 ohm 12 ohm resistor are connected in parallel using a 24V battery. What is the equivalent resistance and power?
2.2 ohms, 262 W
The secondary coil has a voltage of 68 kV. The primary coil has 125 turns and the secondary has 625. What is the primary coil voltage?
14kV
7 nodes 6 antinodes
An electron and proton are separated by 5.3 x e-11m. What is their gravitational force?
3.6 x e-47 N
The current is 6.25 A. If the resistance is 17.6 ohms what is the potential difference?
1.10 x 10e2 V
What happens to the brightness of a bulb if you add more light bulbs to a series circuit and why?
They get more dim. More lightbulbs = more resistance which will reduce current
If a magnet goes closer to an electro magnet, how will the magnetic field orient?
It will be opposite to the magnet's field lines.
What is the evidence that light can behave like a particle and a wave?
when you shine light on metal, you can make electrons eject. If you shoot electrons through slits, constructive and destructive interference occurs