M. J. Moloney CL-109 (812) 877-8302 home: (812) 466-1328

moloney@rose-hulman.edu http://www.rose-hulman.edu/~moloney
 
 

• Problem MJM1.
• In Excel, set up a formula for the magnetic field on the axis of a circular current loop
• The formula is 29-15
• Fill A10..A80 with values 0.10 through 0.80 [these are x values]
• Place the loop at x=0.40 (corresponding to cell A40)
• Let mu_o I/(4 Pi) = 1, and the loop radius be 0.40 m.
• Fill in cells B10..B80 with the formula 29-15
• Make a graph of the columns you have filled in. It reach a max at x=0.4, and be symmetrically decreasing on either side
• Problem MJM2
• Add to MJM1 to put a second coil of the same radius in at x=0.70 m
• Put the formula B for for this coil in C10..C80
• Fill D10..D80 by adding columns B and C together. This is the total field due to both loops.
• Adjust the location of the second loop to achieve a constant field halfway between the loops.
• This should be when the loops are separated by half the radius. (See problem 29-53)
• You can adjust the second loop position with a slider (scroll bar) if you wish.
• Go to View, then Toolbars, then click Forms. A skinny menu will show up
• Click on the scrollbar item. Don't try to drag it, just move to a free spot.
• Then drag horizontally or vertically to create the scroll bar.
• Now right click the scroll bar.
• You can attach the scroll bar to a cell containing the location of the 2nd loop
• You can set the max and min values of the scroll bar
• You are ready to roll. Now dragging on the scroll bar will change the cell and the graph will automatically follow!
• Problem MJM3
• Flash Gordon is lounging around in a rocket at rest with respect to Earth, 9x10^9 m from Earth. Rockets R1 and R2 are travelling at the same speed in a direction such that each will pass Earth, and then later pass Flash. When the lead Rocket R1 passes Earth, clocks are set to zero. After 1 minute on Earth clocks, R2 passes Earth. At 1 minute after zero, rocket R1 passes Flash.
• a) What time does R2's clock read when it passes Earth. (R1 and R2 clocks are synchronized.)
• b) What time does R1's clock read when it passes Flash? (Flash's clocks are synchronized with Earth's)