Exam (elaborations)
Physics 9702 A2 Level.
- Course
- Institution
Physics 9702 A2 Level.
[Show more]
Seller
Follow
lydiaomutho
Content preview
Physics 9702 A2 LevelAlternating current equation - correct answer-I = I0 sin ωt
Define the rms value of an alternating current - correct answer-equal to the steady direct
curent which converts electrical energy to other forms of energy at the same rate and
conditions
Irms = ? - correct answer-I0/√2
Transformer equation - correct answer-Vs/Vp = Ns/Np = Ip/Is
Power loss equation - correct answer-Ploss = I2R
Types of rectification - correct answer-Half-wave and Full-wave
Define capacitance - correct answer-charge stored per unit potential difference
Capacitance equation for parallel plates - correct answer-C = εA/d
Functions of insulator - correct answer-Increases capacitance, increases distance, allows
the use of high voltages
Capacitance equation for sphere - correct answer-C = 4πε0r
Capacitors in series formula - correct answer-1/c = 1/c1 + 1/c2 + 1/c3 + ...
Capacitors in parallel formula - correct answer-c = c1 + c2 + c3 + ...
How are the charges in a capacitor kept separated? - correct answer-work is done by the
battery to separate the charges
Work done equation by capacitor - correct answer-W = (1/2)QV
Coulomb's Law equation - correct answer-F = Qq/4πε0r2
Electric field strength equation - correct answer-Q/4πε0r2
Electric potential equation - correct answer-Q/4πε0r
How does air conduct due to a charged sphere? - correct answer-The electrons of the atoms
of air molecules are stripped off
Magnetic flux equation - correct answer-φ = BA cos θ
Magnetic flux linkage equation - correct answer-Φ = NBA = Nφ
,How does electromagnetic induction occur? - correct answer-when there is change in
magnetic flux linkage or cutting of the magnetic flux
Faraday's Law equation - correct answer-E = -δ(Nφ)/δt
The magnitude of the induced emf depends on - correct answer-velocity, magnetic field and
no. of turns
Lenz's Law - correct answer-The direction of the induced emf is such that its magnetic effect
always oppose the change producing it
When do eddy currents occur? - correct answer-when a conductor moves in a non-uniform
magnetic field, when a conductor is in a region of changing magnetic field
What effects do eddy currents give? - correct answer-heating and magnetic effects
How is the direction of eddy currents determined? - correct answer-Using Lenz's Law
Describe the process of eddy currents induction - correct answer-rate of cutting magnetic
flux is not uniform so different emfs induced at different parts therefore current flows due to
difference in emf induced
How do eddy currents dissipate energy in shm? - correct answer-derived from kinetic energy
of oscillations which depends on amplitude
Force on conductor equation - correct answer-F = BIL sin θ
What is the force on the conductor caused by? - correct answer-the interaction between two
magnetic fields
Force on moving particle - correct answer-F = Bqv sin θ
What is the direction of the force acting on a conductor? - correct answer-perpendicular to
the magnetic field
What causes a particle to move in a helical shape? - correct answer-enters a magnetic field
at an angle
Interaction between two wires of same current direction - correct answer-repel
Interaction between two wires of opposite direction - correct answer-attract
Ideal gas equation - correct answer-pV = nRT
Boyle's Law - correct answer-pressure is inversely proportional to volume
Charles' Law - correct answer-volume is directly proportional to temperature
, Pressure Law - correct answer-pressure is directly proportional to temperature
Describe and explain the brownian motion - correct answer-smoke particles are randomly
bombarded with air molecules causing haphazard, erratic and jerky movement of the
particles
Ideal gas assumptions - correct answer-negligible volume of gas compared to container,
negligible intermolecular forces, constant random motion, collisions are perfectly elastic
Pressure of gas equation - correct answer-p = (1/3) Nm/V < c2>
Energy of gases equation - correct answer-Kinetic energy = 3/2kT
Internal energy of all molecules of gas - correct answer-U = 3/2NkT
Acceleration in shm - correct answer-a=-ω2x
Angular frequency equation - correct answer-ω = 2πf
Displacement of shm - correct answer-x = x0 sin ωt
Velocity formula of simple harmonic motion - correct answer-v = x0ω cos ωt = ±ω √(x02-x2)
Kinetic energy of shm - correct answer-E = (1/2)mω2(x02-x2)
Total energy of shm - correct answer-E = (1/2)mω2x02
Types of damping - correct answer-light, critical, heavy
When does resonance occur? - correct answer-When natural frequency is equal to driving
frequency
Effects of damping - correct answer-amplitude of all frequencies decrease, natural frequency
decreases, resonance peak is broader and flatter
What is thermal equilibrium? - correct answer-when two objects have the same
temperatures and net heat transfer is zero
What is thermometric property? - correct answer-a property which changes with temperature
Ice point - correct answer-0°C
Steam point - correct answer-100°C
Triple point of water - correct answer-273.16 K
absolute zero - correct answer-0 K
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller lydiaomutho. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82956 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now