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Q..6. A helicopter has blades of length 6 m, rotating at 4.1 rev/s about a central hub. If the vertical component of Earth's magnetic field is 4.5×10?5 T, what emf is induced between the blade tip and the central hub?Answer in units of mV. Q.8. A generator can be made using the component of Earth's magnetic field that is parallel to Earth's surface. A 110-turn square wire coil with an area of 4.70 ×10?2 m2 is mounted on a shaft so that the cross-sectional area of the coil is perpendicular to the ground. The shaft then rotates with a frequency of 25.0 Hz. The horizontal component of the Earth's magnetic ?eld at the location of the loop is 1.00 ×10?5 T. Calculate the maximum emf induced in the coil by Earth's magnetic field. Answer in units of V.
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
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