Electricity and Magnetism
GCE Physics

a) State Faraday's law of electromagnetic induction and Lenz's law. (4 marks) b) A rectangular coil of 200 turns, each of area 0.05 m², is placed in a uniform magnetic field of flux density 0.8 T. Th…

a) i) Define the term 'capacitance' of a capacitor. (1 mark) ii) State the unit of capacitance. (1 mark) b) Three capacitors of capacitances 4 µF, 6 µF and 12 µF are connected as follows: the 6 µF…

An electric iron rated 1000 W, 250 V is used for 2 hours daily for 30 days. If the cost of electricity is ₦50 per kWh, what is the total cost of using the iron for the 30 days?

A cell of e.m.f. 1.5 V and internal resistance 0.5 Ω is connected to an external resistor. If the terminal voltage of the cell is 1.2 V, what is the value of the external resistance?

Which of the following best explains why a soft iron core is used in a transformer instead of a steel core?

Which of the following statements correctly describes the direction of the magnetic field around a straight current-carrying conductor?

In a step-down transformer, the primary coil has 2000 turns and the secondary coil has 400 turns. If the primary voltage is 240 V, what is the current in the secondary coil when the primary current is…

Three capacitors of capacitances 2 μF, 3 μF and 6 μF are connected in series across a 12 V supply. What is the charge stored on the 6 μF capacitor?

An alternating voltage is represented by $V = 120\sin(100\pi t)$ volts. What is the root mean square (r.m.s.) value of this voltage, correct to one decimal place?

A conductor of length 0.5 m carrying a current of 4 A is placed perpendicular to a uniform magnetic field of flux density 0.3 T. What is the magnitude of the force acting on the conductor?

A resistor of 8 Ω is connected in parallel with a resistor of 12 Ω. The combination is then connected in series with a 4 Ω resistor and a 12 V battery of negligible internal resistance. What is the cu…