PLEASE ANSWER ALL Q4 A flerible loop of wire ties in a uniform nagnetic field af

Question

PLEASE ANSWER ALL

Q4 A flerible loop of wire ties in a uniform nagnetic field af magnitude B directed into the plane of the picture x The loop is polled as shown, reducing its area. The induced current x. A. flows downward through resistor R and is proportional to B B. flows upward through resistor R and is proportional to B C. lows dowward through resistor R and is proportional to E D. flows upward through resistor R and is proportional to E. none of the above 20 Q5 The rectangular loop of wire is being moved to the right at constant velocity. A constar: cucrent IMows in the long straight wise in the direction showa. The current induced in the oop is A. cloclzwise and proportional to B courterclockwise and proportonal to I C. clockwise and pcoportional to D. courtedocnnse and propomoral to E. zero.

Explanation / Answer

4) Ans: A. flows downward through resistor R and is proportional to B.

Steps: 1. First notice the direction of the magnetic field (it is into the page)

2. The flux through the loop is decreasing so put your thumb of the right hand along the magnetic field, meaning point your thumb into the page ( if the flux was increasing then you would have to point your thumb against the magnetic field ).

3. Notice the curling of your fingers ( in this case they are curling clockwise, which means the current in the loop is clockwise and so downward through the resistor ). As the induced current is proportional to the induced emf which depends on the magnetic field, so the current will be proportional to B and not B2.

5) Ans: E. zero

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