An industrial high-intensity discharge lamp is operated using a step-up transformer connected to a 120 V AC mains supply. The transformer has 150 turns on its primary coil and 3000 turns on its secondary coil. The equivalent resistance of the discharge lamp under operating conditions is 80 kΩ80\text{ k}\Omega80 kΩ and it is connected directly across the secondary coil. Assuming the transformer is ideal, what is the current through the discharge lamp?
7.5×10−5 A7.5 \times 10^{-5}\text{ A}7.5×10−5 A
3.0×10−2 A3.0 \times 10^{-2}\text{ A}3.0×10−2 A
0.60 A0.60\text{ A}0.60 A
30 A30\text{ A}30 A
34 exam-style questions on OCR A A Level Physics Electromagnetism, covering Magnetic fields, Motion of charged particles, and Electromagnetism. Each one has a worked solution and a mark scheme showing where the marks go.