Current in a vacuum and resistance of metals
Answers are for parents and teachers.
1
A copper wire has R₀ = 25 Ω, α = 0.004 °C⁻¹, Δt = 100 °C. What is R (Ω)?
35
2
An iron wire: R₀ = 10 Ω and R = 16 Ω at 100 °C. What is α (°C⁻¹)? (decimal)
0.006
3
Accelerating an electron through 50 V raises its energy by how many eV?
50
4
On a diode characteristic I = 3 mA at 36 V. If the voltage is 4 times larger, what is the current (mA) by Iₐ ∝ U^(3/2) (below saturation)?
24
5
State one application of superconductivity.
Strong magnets for MRI scanners and particle accelerators.