The circuit shown in the figure contains a resistor and a solenoid. A battery is connected by closing the switch in the figure and provides an EMF Vbat = 15 V. At a time t = 50 ms after the switch is closed the current in the circuit reaches a value of 1.0 A which corresponds to 25 % of its steady state value. What are the values of the resistance and inductance? State your answer to 2 s.f.

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Q: L ll R R L + V L ell

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Q: S L R 2 R Consider the circuit on the left. The bat- tery has an EMF of 20.0 volts and negligi- ble…

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Electromagnets

The word "electromagnet" is composed of two words, ‘electro’ and ‘magnet’. It is a type of magnet in which an electric current helps in the generation of a magnetic field. Electromagnets usually consist of two major parts, wire and a coil around which the wire is wound. This is called a solenoid. When an electric current is allowed to pass through the coiled wire, the electric current produces a magnetic field. This magnetic field is present only when current is passing through the wire.