Why are transformer cores made of laminated, rather than solid, magnetic material?
What will be an ideal response?
The changing flux in the transformer core tries to induce currents in the core material. These currents would lead to energy loss and undesirable heating effects. Lamination reduces the current flow and loss.
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One of the most fundamental discoveries about the universe has been that it is expanding. "The universe is expanding" means
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According to Copernicus, retrograde motion occurs at opposition for the outer planets
Indicate whether the statement is true or false
A tsunami, an ocean wave generated by an earthquake, propagates along the open ocean at 700 km/hr and has a wavelength of 750 km. What is the frequency of the waves in such a tsunami?
A) 0.93 Hz B) 0.00026 Hz C) 1.1 Hz D) 6.8 Hz E) 0.15 Hz