11. An electron passes near a positive ion. Which of the following determines wh

Question

11. An electron passes near a positive ion. Which of the following determines whether the electron will be captured by the ion? (a) If the potential energy of the electron and ion system is negative (b) The electric field from the ion is stronger than the local magnetic field (c) The Coulomb force is able to supply the required centripetal force (d) The total energy is less than zero 12. A square loop of wire moves with constant speed, v, from a field-free region into a region of uniform B field, as shown, and then back into a field free region. Which of the following graphs correctly shows the induced current, I, in the loop as a function of time, t? B out (a) i (b) i (c) i (d) j (a) a (b) b (c) C (d) d (e) e 13. If in an RLC series circuit the maximum voltage of the inductor is greater than the maximum voltage of the capacitor, which of the following actions will bring the circuit into resonance? (a) Placing a new resistor in series with the other resistor? (b) Placing a new inductor in series with the other inductor? (c) Placing a new capacitor in series with the other capacitor? (d) Increase the frequency?

Explanation / Answer

An electron passes near a positive ion. The factor which determines whether the electron will be captured by the ion is:

(d) The total energy is less than zero.

It is because electron capture occurs when neutrons and protons are below the band of stability, but there is not enough energy to emit a positron.

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