A circuit is constructed with four resistors, one inductor, one battery and a switch as shown. The values for the resistors are: R1 = R, ww R. R2 = 39 0, R3 = 62 Q and R4 = 126 Q. The inductance is L = 362 mH and the battery voltage is V = 12 V. The positive terminal of the battery is indicated with a + sign. ww 1) The switch has been open for a long time when at time t = 0, the switch is closed. What is l4(0), the magnitude of the current through the resistor R4 just after the switch is closed? 0.053 A Submit 2) What is l4(0), the magnitude of the current through the resistor R4 after the switch has been closed for a very long time? 0.063 A Submit 3) What is IL(o), the magnitude of the current through the inductor after the switch has been closed for a very long time? Submit 4) After the switch has been closed for a very long time, it is then opened. What is I3(topen), the current through the resistor R3 at a time topen = 6.8 ms after the switch was opened? The positive direction for the current is indicated in the figure. Submit 5) What is VLmax(closed), the magnitude of the maximum voltage across the inductor during the time when the switch is closed? Submit 6) What is VL.max(open), the magnitude of the maximum voltage across the inductor during the time when the switch is open? Submit

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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.