True or False A small circle\'s radius is r. A big circle\'s radius is R. The ra

Question

True or False

A small circle's radius is r. A big circle's radius is R. The ratio of the two circle's area is A_small/A_big = r/R. () A small circle's radius is r. A big circle's radius is r. The ratio of the two circle's area is A_small/A_big = r^2/R^2 = (r/R)^2. () For a toroid shown here, if the wires are densely packed, the B field inside the toroid follows the dashed line and the arrows of B. () The total amount of current passing through the dashed closed loop is I. () The total amount of current passing through the dashed closed loop is 181. () The total amount of current passing through the dashed closed loop is 141. () A toroid can be used to produce a reasonably uniform magnetic field. () A solenoid can be used to produce a reasonably uniform magnetic field. It is a long wire rounded in the form of a () An ideal solenoid has very closely packed turns of wires and a length much longer than the radius of the turns. () An ideal solenoid has very closely packed turns of wires and a length much shorter than the radius of the turns. () When the turns on the solenoids are closely packed, the solenoid can be considered as many circular loops. We can use the right hand rule as the following: when the four fingers are bending along the direction of current flow of the solenoid, the thumb represents the direction of the B field outside the solenoid. () When the turns on the solenoids are closely packed, the solenoid can be considered as many circular loops. We can use the right hand rule as the following: when the four fingers are bending along the direction of current flow of the solenoid, the thumb represents the direction of the B field inside the solenoid. () For an ideal solenoid, the B field is uniform inside it and is close to zero outside it. () For an ideal solenoid, the B field is uniform outside it and is close to zero inside it.

Explanation / Answer

1) False

2) True. Because area of circle is (pi)*r2

3) True

4) True

5) False

6) False

7) True

8) True

9) True

10) False

11) True

12) false

13) True

14) False. Because inside field never zero

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