4. Electricity and magnetism – Page 4

Exercise 4.8 C

Determine the capacitance of the capacitor and the phase between the voltage and the electric current.

Answer: $180\ \mu F$ ; $-60°$

Determine the inductance of the coil and the phase between the voltage and the electric current.

Answer: $12\ mH$ ; $17°$

Determine the inductance of the coil and the phase between the voltage and the electric current.

Tip: ${U{_{R{_L}}}}^2+{U{_L}}^2= {U{_{R{_L}+L}}}^2$

Answer: $0{,}71\ mH$ ; $1{,}1°$

Determine the inductance of the coil and the capacitance of the capacitor. What would be the resonant frequency of this circuit?

Tip: When calculating the inductance of the coil, remember ${U{_{R{_L}}}}^2+{U{_L}}^2= {U{_{R{_L}+L}}}^2$

Answer: $13\ mH$ ; $210\ \mu F$ ; $97\ Hz$

Determine the electrical resistivity of wirewound resistor.

Answer: ${\rho=129\cdot10^{-8}\ \Omega m}$