If a brass wire is 4 cm long with a diameter of 1.3 cm, can you use the set-up in this lab to measure its resistance? (Hint: consider the limitation of sensitivity for measuring voltage.) ( No. The voltage over the wire is 0.022 mV at 1.0 A and only 0.044 mV even at 2.0 A!)

Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

What structural formula represents 4 electrons shared between two atoms?