Created by StemPy LabA metal sphere of radius carries no net charge. Inside it there is a small spherical cavity, not at the centre, and a point charge sits inside the cavity, away from the cavity's centre. A second point charge is held outside, from the centre of the sphere. Take . Which of the following statements are correct?
One or more options are correct. Tick all the correct ones: a wrong option costs marks, and a part-right answer earns part of the marks.
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← A solid ball of radius 6.0 cm carries a charge spread evenly through its volume. The ball is made of a material that does not change the field, so treat its inside as empty space. It is far from everything else. The energy of the ball's charge is stored in its electric field, with 12ε₀E² joules in each cubic metre, both inside the ball and outside it. Imagine a sphere of radius r, with the same centre as the ball. Inside that sphere lies exactly half of the total energy stored in the field. What is r? Give the answer in cm.A uniform magnetic field of 0.20 T fills the region to the right of a straight boundary and points out of the page, as in the figure. A proton moving at 2.0 × 10⁶ m/s crosses the boundary into the field, at 30° to the normal, tilted towards the top of the page. Take the proton's mass as 1.67 × 10⁻²⁷ kg and its charge as 1.6 × 10⁻¹⁹ C. Which of the following statements are correct? →
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