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Q1. An electron accelerated from rest through the voltage of 500V enters a region of constant magnetic field. If the electron follows a circular path with a radius of 17cm, what is the magnitude of magnetic field?

Q2. An enemy ship is on the east side of a mountain island, as shown in Figure P4.71. The enemy ship has manoeuvred to within 2500 m of the 1800m high mountain peak and can shoot projectiles with an initial speed of 250m/s. If the western shoreline is horizontally 300 m from the peak, what are the distances from the western shore at which a ship can be safe from the bombardment of enemy ship?

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