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electric current
2. Series 9. Year - E. afternoon tea
Establish the resistance of electric spiral boiler
Hint: Warm up water and measure the evolution of its temperature in time.
1. Series 9. Year - 3. plate capacitor
A capacitor formed by two parallel metal plates of area $S$ each placed in a distance $l_{1}$ one from another are charged at the voltage $U_{b}$. What work must be performed to move the plates apart to distance $l_{2}$, if we
- had disconnected,
- hadn’t disconnected
the battery..