Starting from the position indicated in the drawing, the semicircular piece of w
ID: 1438435 • Letter: S
Question
Starting from the position indicated in the drawing, the semicircular piece of wire rotates through half a revolution in the direction shown.
Which end of the resistor is positive—the left or the right end?
the left end the right end
Explain your reasoning.
The induced magnetic field opposes the decrease in magnetic flux. The induced magnetic field points in the same direction as the original magnetic field. Induced current flows clockwise around the loop. Current flows through a resistor from higher potential toward lower potential. all of the above
The drawing shows a straight wire carrying a current I. Above the wire is a rectangular loop that contains a resistor R. If the current I is decreasing in time, what is the direction of the induced current through the resistor R—left-to-right or right-to-left? If the induced current goes from left to right through the resistor, type the letters "LTR" in the box below. If the current goes from right to left through the resistor, type the letters "RTL" in the box.
Direction of induced current =
The battery charger for an MP3 player contains a step-down transformer with a turns ratio of 1:47, so that the voltage of 120 V available at a wall socket can be used to charge the battery pack or operate the player. What voltage does the secondary coil of the transformer provide?
V
A transformer consisting of two coils wrapped around an iron core is connected to a generator and a resistor, as shown in the drawing. There are 12 turns in the primary coil and 17 turns in the secondary coil. The peak voltage across the resistor is 67.1 V. What is the peak emf of the generator?
V
Explanation / Answer
1)
From the len's law we have:
-B is in.
-Magentic flux decreases because area decreases.
-This mean current flow must be clockwise so:
*The right end is positive since the induced current in the circuit flows clockwise around the circuit.
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