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Q. Charged particle moves in a region of uniform field along a helical path (radius = 3.0 cm, pitch = 9.0 cm) as shown. What is the angle between the velocity of the particle and the magnetic field?

Q. A 87 arrow is fired from a bow whose string exerts an average force of 120N on the arrow over a distance of 78cm. What is the speed of the arrow as it leaves the bow?

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