The Arrangement Shown In Figure Q2b Is Now Adapted To Function As A Dc Motor And Connected To A Power Supply Of Emf 7 0 1 (25.91 KiB) Viewed 12 times
The Arrangement Shown In Figure Q2b Is Now Adapted To Function As A Dc Motor And Connected To A Power Supply Of Emf 7 0 2 (28.27 KiB) Viewed 12 times
The arrangement shown in Figure Q2b is now adapted to function as a DC motor and connected to a power supply of emf 7.0 V. When the frame is initially at rest, the edge RU experiences a magnetic force of magnitude 0.76 mN (milli-newton). (d) i) Calculate the initial current in the frame and show that its resistance is around 1 2. When the frame is rotating at a constant angular velocity, it experiences a back emf of 4.8 V. ii) Explain how this comes about and calculate the current in the frame in this situation. [5]
A square metal frame RSTU, of edge length 356 mm, is placed between the same magnetic poles as shown in Figure Q2a. The square frame is initially in the horizontal plane, as shown in Figure Q2b, such that the angle between the magnetic field lines and the normal to the square frame is 90°. W U S South North V Figure Q2b - A square frame between magnetic poles R T
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