An ideal step-up transformer has an input potential difference of 15 V across its primary coil. The primary coil has 80 turns and the secondary coil has 1200 turns. The secondary circuit is completed with a load resistor of 75 kΩ75\text{ k}\Omega75 kΩ.
What is the current in the secondary coil?
3.0×10−3 A3.0 \times 10^{-3}\text{ A}3.0×10−3 A
1.3×10−5 A1.3 \times 10^{-5}\text{ A}1.3×10−5 A
3.0 A3.0\text{ A}3.0 A
2.0×10−4 A2.0 \times 10^{-4}\text{ A}2.0×10−4 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.