Author Question: The current in a long wire creates a magnetic field in the region around the wire. How is the ... (Read 72 times)

Zulu123 · **on:** Jul 28, 2018

The current in a long wire creates a magnetic field in the region around the wire. How is the strength of the field at distance r from the wire's center related to the magnitude of the field?
a. field directly proportional to r
c. field directly proportional to r2
b. field inversely proportional to r2
d. field inversely proportional to r

Question 2

A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0 Hz and an amplitude of 8.0 cm. If a timer is started when its displacement from equilibrium is a maximum (hence x = 8 cm when t = 0), what is the displacement of the mass when t = 3.7 s?
a. zero
b. 0.025 m
c. 0.049 m
d. 0.080 m