MDCAT Pakistan · Physics

Thermodynamics and Electromagnetism

9 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 9 questions

  1. A Carnot heat engine operates between a high-temperature reservoir at 500 K and a low-temperature sink at 300 K. What is its maximum theoretical thermodynamic efficiency?
  2. During an isothermal expansion of an ideal gas at temperature T, the volume doubles from V to 2 V. How much work is done by n moles of the gas?
  3. Two point charges of +4.0 microcoulombs and -1.0 microcoulombs are separated by a distance of 30 cm in air. At what point along the line passing through them (outside the charges) is the net electric…
  4. A parallel-plate capacitor has capacitance C0 in vacuum. If a dielectric slab of dielectric constant kappa = 4.0 is inserted filling the gap, and the plate separation is halved (d / 2), what is the ne…
  5. In a direct-current circuit, three resistors of 6 ohms, 12 ohms, and 4 ohms are connected in parallel across a 12 V battery. What is the total current drawn from the battery?
  6. A proton moves with velocity v = 2.0 x 10^6 m/s perpendicular to a uniform magnetic field B = 0.50 T. What is the radius of its circular orbit? (Mass of proton = 1.67 x 10^-27 kg, charge = 1.6 x 10^-1…
  7. What is the magnetic field B at the center of a long solenoid having 500 turns per meter carrying a current of 2.0 A? (Take mu_0 = 4*pi x 10^-7 T m / A)
  8. Which law states that the induced electromotive force (EMF) in a closed circuit always opposes the change in magnetic flux that produces it?
  9. How does the electrical resistance of a pure intrinsic semiconductor change as temperature increases?

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