The current in a long wire creates a magnetic field in the region ...

[Zulu123]

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

[shailee]

Answer to Question 1

D

Answer to Question 2

B

[Zulu123]

Wow, this really help

[Liamb2179]

Thanks for the timely response, appreciate it