A circular loop of wire has its radius doubled in time Ät.A uniform magnetic field is at an angle of 60^° to the plane of the coil,and the magnetic field halves its intensity in the same time interval Ät.During this interval,what happens to the flux through the coil? A) It decreases. B) It remains the same. C) It increases. D) More information is needed to make this conclusion.

Question

Quizplus · Accepted Answer

The magnetic flux is proportional to the product of the magnetic field strength, the area of the loop, and the cosine of the angle between the field and the normal to the loop. Doubling the radius increases the area by a factor of four, while halving the magnetic field strength reduces the flux by a factor of two. Overall, the flux increases by a factor of two.

A Circular Loop of Wire Has Its Radius Doubled in Time