Author Question: A coil is placed in a magnetic field and has a flux FB through it. The coil is stressed so that its ... (Read 82 times)

@Brianna17 · **on:** Jul 28, 2018

A coil is placed in a magnetic field and has a flux FB through it. The coil is stressed so that its area reduces to 60 of its original value. If the plane of the coil stays the same and the flux through it remains the same, how must the magnetic field change?
a. It must increase by 60.
c. It must decrease by 40.
b. It must increase by 120.
d. It must increase by 67.

Question 2

A 0.20-kg mass is oscillating on a spring over a horizontal, frictionless surface. When it is at a displacement of 2.6 cm from equilibrium, it has a kinetic energy of 2.7 J and a spring potential energy of 2.2 J. What is the maximum speed of the mass during its oscillation?
a. 3.7 m/s
c. 6.0 m/s
b. 4.7 m/s
d. 7.0 m/s