Draw a schematic diagram of a circuit consisting of a battery of
three cells of 1.5V each, a plug key, a 4Ω resistor, a 6Ω resistor
and an 8Ω resistor all connected in parallel. Connect an ammeter
to measure the current across the 8Ω resistor and a voltmeter
across all three resistors to measure the voltage, what would be
the readings of the ammeter and voltmeter?

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)