Show the direction of the induced current in the above diagram at f = 6 In Figur

Question

Show the direction of the induced current in the above diagram at f = 6 In Figure above, a carboard tube is wrapped with windings of opposite directions, as shown in the figure. Terminals a and b of may be connected to a battery through a reversing switch. State whether the induced current is the resistance R is from left to right R or from right to left in the following circumstances: the current in winding A is from a to b and is increasing; explain your answer. the current in winding A is from b to a and is decreasing; explain your answer. the current in winding A is from b to a and is increasing; explain your answer. In the , you connect a resistor and a capacitor with unknown values in series with a battery of emf epsilon = 12 V. You include a switch in the circuit. When the switch is closed at time I = 0, the circuit is and you measure the current through the as a function of time as plotted below. A data-fitting program finds that the current decays according to the equation Using common symbols for the battery, the resistor, the capacitor, and the switch draw the circuit that you constructed. Show the circuit before the switch is closed and include whatever other devices you need to the current through the resistor to obtain the above plot. Label each component in your diagram. Having obtained the curve shown above, determine the value of the resistor that you placed is this circuit. What capacitance did you insert in the circuit to give the result above?

Explanation / Answer

Here you must make use of Lenz's law which states that "an induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the original change in magnetic flux" .

a)current is from a to b and increasing : this means the magnetic field generated by that current is pointed to the left and the flux is increasing in that direction . Hence to oppose that flux the induced current must be generated such that its magnetic field is pointed to the right , so the induced current should be from left to right (or clockwise) .

b) from b to a and decreasing : this means the magnetic flux is pointed to the right but it's decreasing due to the decrease of the current , hence the induced current must be pointed from left to right , or clockwise .

c) from b to a and increasing : this means the magnetic flux is pointed to the right and it's increasing , hence the induced current must be pointed from right to left (counterclockwise) .

Hope that helps .

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