Charges
A proton has a ________ charge
positive charge
Give the formula for Work done.
A - W = qEd
B - W = E/d
A
Give the SI unit for Magnetic flux
Weber (Wb)
Give the SI unit for Magnetic Field Strength
Tesla (T)
Give the SI unit for acceleration.
m/s/s
Give the charge on an electron.
A (1.602 x 10^-19 C)
B (-1.602 x 10^-19 C)
C (9.11 x 10^-31 C)
B
Calculate the work done on a proton (1.6 x 10^-19 C) which travels a distance of 20cm given the electric field strength is 2000 N/C.
W = qEd
W = (1.6 x 10^-19) x 2000 x 0.2
W = 6.4 x 10^-17
Calculate the acceleration experienced by an electron travelling in a uniform electric field with a strength of 3.1 x 10^-5 N/C.
Given the calculated force
F = 4.97 x 10^-6 N
a = F/m
a = 4.97 x 10^-6 N/ 9.109 x 10^-31 kg
a = 5.5 x 10^6 m/s/s
Give the formula for torque
A - V x d
B - F x d
B
Calculate the acceleration experienced by an electron travelling in a uniform electric field with a strength of 3.1 x 10^-5 N/C.
FIND THE FORCE
F = qE
F = (-1.602 x 10^-19) x (3.1 x 10^-5)
F = 4.97 x 10^-6 in the opposite direction
Give the mass of an electron
A - 1.67 x 10^-27 kg
B - 9.11 x 10^-31 kg
C - 6.67 x 10^-31 kg
A
A uniform electric field is set up between two parallel plates that are 3mm apart with a potential difference of 12V.
What is the magnitude of the electric field?
E = V/d
E = 12/0.003
E = 4000 V/m
A student places a square coil of wire with a side length of 5cm into a uniform vertical magnetic field of 0.1T.
Calculate the magnetic flux
Ø = B x A
Ø = 0.1 x (0.05 x 0.05)
= 0.00025 Wb
= 2.5 x 10^-4 Wb
A motor lifts a mass of 400g. The motor has 200 turns in 0.3T magnetic field. If the radius is 0.142m
Determine the force required to lift the mass.
F = m x g
F = 0.4kg x 9.8m/s/s
F = 3.92N
How far apart are two conducting plates that have an electric field strength of 4.50× 103 V/m between them, if their potential difference is 15.0 kV?
d = V/E
d = V/E
d = 15 000/4500
d = 3.3m
Calculate the force on a proton given the electric field strength is 2000 N/C.
F = qE
F = (1.6 x 10^-19)(2000)
F = 3.2 x 10^-16
An electron travels with a velocity of 3 x 10^4 m/s at angle of 40o in a uniform electric field of magnitude 5000 N/C.
Find the acceleration of the electron due to the electric field.
a = Eq/m
a = 5000 (-1.6 x 10^-19) / (9.11 x 10^-31)
a = -8.8 x 10^14 m/s/s
A rectangular wire loop is connected to DC. One side of the loop is next to the magnet. The loop is free to rotate.
If the side length closest to the magnet is 20cm. Calculate to torque experienced by a 3kg mass.
Torque = F x d
Torque = mg x d
T = mg x d
T = 3 x 9.8m/s/s x 0.2
T = 5.88 N/m
Calculate the radius if the magnetic field strength is 0.020 T up the page. Each subatomic particle is fired with a velocity of 4000 m/s.
r electron =
(9.11 x 10^-31)(4000) /(-1.6 x 10^-19)(0.02)
= 1.1 x 10^-6 m
The electric field strength between two parallel conducting plates separated by 4.00 cm is 7.50 × 10^4 V/m.
What is the potential difference between the plates?
V = E x d
V = 7.5 x 104 x 0.04
V = 3000V
Calculate the electric field strength on a proton given the force is 200N.
E = F/q
E = 200/(1.6 x 10^-19)
E = 1.25 x 10^21 N/C
An electron travels with a velocity of 3 x 10^4 m/s at angle of 40o in a uniform electric field of magnitude 5000 N/C.
Find the acceleration of the electron due to the electric field.
a = Eq/m
a = 3000 (-1.6 x 10^-19) / (9.11 x 10^-31)
a = -5.28 x 10^14 m/s/s
A 5.0 cm wire carries a current of 0.75 A. Calculate the force acting on the wire when it is placed at right angles in a 0.60 T magnetic field.
F = ILB Sin (pheta)
F = 0.75 x 0.05 x 0.6 Sin 90
F = 0.0225 N or 2.25 x 10-2N
A current of 0.87 A flows in a wire of length 1.4 m placed at 30o to a magnetic field of flux density 80 mT.
Calculate the force on the wire.
F = ILB Sin (pheta)
F = 0.87 x 1.4 x 0.08 Sin 30
F = 0.049 N or 4.9 x 10-2N
The electric field strength between two parallel conducting plates separated by 5.00 cm is 7.50 × 104 V/m.
What is the potential difference between the plates?
V = E x d
V = 7.5 x 104 x 0.05
V = 3750V