Physics - Electricity and Magnetism Quiz

Electricity and Magnetism

• Velocity in a medium is calculated as v = A * f, where A is a constant and f is the frequency.
• Lens equation relates object distance (u), image distance (v), and focal length (f) through the formula: 1/u + 1/v = 1/f.
• When changing mediums, the velocity is described by v2 = λ2 * sin(θη), where λ is the wavelength and θ is the angle of incidence.
• Magnification (m) is defined as the ratio of image distance to object distance: m = v/u.
• The relationship between height of the image (h) and the original height (h_o) can also be expressed as m = h/h_o.
• Charge (Q) is quantified as Q = It, where I is current and t is time.
• Total charge can also be represented as Q = Nq, where N is the number of charge carriers and q is the charge of each carrier.
• Energy (E) and work done are calculated using the expression E = VQ, where V is voltage.
• Another formulation of energy is E = Vlt, where l is the length of the conductor.
• Power (P) can be calculated using the formula P = VI, relating voltage (V) and current (I).
• Power can also be computed using P = PR, where R is the resistance in the circuit.
• Electromotive force (emf) is the sum of potential differences (pd's) in a circuit, expressed as P = IR.
• Energy can be calculated with the relationships E = PRt, E = V^2t, E = V^2/R, and E = PR/R.
• For transformers, the relationship between the number of turns in the primary (Np) and secondary (N) coils is expressed as N/Np = Vs/Vp, where Vs and Vp are secondary and primary voltages respectively.
• Efficiency of a transformer is given by Efficiency = Ps/Pp * 100, where Ps is the secondary power and Pp is the primary power.

The Physics of the Atom

• Ideal transformers operate at 100% efficiency, following the same relationship as above: N/Np = Vs/Vp.

Test your understanding of key concepts in electricity and magnetism. This quiz covers important equations, including lens equations, magnification, charge calculations, and transformer efficiency. Get ready to challenge yourself on the principles that govern electrical and magnetic interactions.