Question

What is the angle between the area vector \[A\] of the coil and the magnetic field \[B\] at time \[t\]?

Options

• \[\theta=\omega t\]

• \[\theta=Bt\]

• \[\theta=At\]

• \[\theta=\omega/t\]

Answer 1

At constant angular speed, the angle changes as \[\theta=\omega t\]. This changing angle makes the magnetic flux through the coil vary with time.