Physics - Grade 12 -2023 G.C

Grade 12 students can now access their exam results by visiting the Educational Assessment and Examination Services (EAES) website.

4. A positive point charge of 2µC is placed on the x-axis at the origin and a positive charge of 6 µC and a negative point charge of -4 µC are placed, respectively at x=-3cm and x=+3cm on the x-axis. What is the net electric force on the 2 µC charge?

  1. 40 N toward the negative x-axis
  2. 40 N toward the positive x-axis
  3. 200 N toward the positive x-axis
  4. 200 N toward the negative x-axis

5. Consider a point charge Q in an electrostatic field and a point mass m in a gravitational field. Which one of the following statements is correct about the potential energy of the objects?

  1. The gravitational force on mass m is in the same direction of gravitational field while electric force on Q in the same or opposite directions of electric field depending the sign of the charge.
  2. The potential energies at distance r, from the field sources for both Q and m vary inversely with r2.
  3. The potential energy of the point charge and that of the point mass changes as they move over equipotential surfaces in their respective fields.
  4. The electric potential decreases as a positive charge moves opposite to the electric field while the gravitational potential of the mass increases when it moves along the gravitational field.

6. Four resistors are connected to a voltage source as shown in the circuit phoos diagram shown below
What are the current through the 3 Ω resistor and the voltage drop across the 4 Ω resistor, respectively?

  1. ¾A and 8 V
  2. 4⁄3A and 8 V
  3. 2A and ¾ V
  4. 2⁄3A and 4 V

7. An electron moving with a speed of 2.2x107m/s east enters in the region of magnetic field strength of 5x10-4 directed north. What is the magnetic force experienced by the electron?

  1. 1.76x10-15 N towards north direction
  2. 3.64x10-30 N, towards east direction
  3. 8x10-15 N, perpendicular to north and east directions
  4. 1.76x10-15 N, perpendicular to north and east directions

8. A magnetic field intensity of 4x10-4 T crosses a coil having face area 100cm2 and 5x104 turns perpendicular to the face of the coil. If the magnetic flux in the coil set to zero within 2 ms. What is the magnitude of the induced emf in the coil?

  1. 2x10-5 V
  2. 10 V
  3. 100 V
  4. 4x10-4 V

We have provided these questions from previous years grade 12 Ethiopian Secondary School Leaving Certificate Examination (ESSLCE) exams with the sole purpose of assisting students in their studies and preparations for upcoming exams. Please be aware that these questions are not indicative of future exam content. Good luck with your studies!

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