1- A capacitor with a capacitance of 85 microfarads is discharged through a resistance of 66 kilo-ohms. How many milliseconds does it take for the voltage to drop to 1/e of its initial value. Here "e" is the base of natural logarithms, about 2.718 .

2- A micro-teslais 10^-6 T, and Earth's magnetic field is about 50 micro-teslas. Suppose you have a long wire carrying 10 A of current and you bring up your compass to see if it can be made to deflect by the wire. As you bring it close, at what distance from the wire might you expect to see the compass move if it is sensitive to 20% of Earth's field?

O 2 meters or closer 20 cm or closer O 1 cm or closer O 10 meters or closerA vector pointing toward the charge with magnitude kO/r2 A vector pointing away from the charge with magnitude kO/r-2 O A scalar constant along curved lines around the charge. O A vector pointing away from the charge with magnitude kQ/rPut these in order of increasing strength, weakest first. Electromagnetic force Gravity Strong nuclear force Weak nuclear force\f