X Y, Q9.Two electrons, and travel at right angles to a uniform magnetic field. X Y FX, FY. experiences a magnetic force, and experiences a magnetic force, X Y? What is the ratio if the kinetic energy of is half that of A B C D 1 (Total 1 mark) M1. (a) C = A/d C1 15.6 nF or 16 nF A1 2 (b) (i) 2.4 × 109 (V) B1 1 (ii) ½ CV2 (or ½QV if attempt to calculate Q made) C1 4.3–5.0 × 1010 J A1 2 (iii) 36–40 C B1 1 (c) recognition that 1% of charge or voltage remains C1 any appropriate form of decay equation (either exponential or logarithmic) C1
Q9.Two electrons, X and Y, travel at right angles to a uniform magnetic field. X experiences a magnetic force, FX, and Y experiences a magnetic force, FY. What is the ratio if the kinetic energy of X is half that of Y? A B C D 1 (Total 1 mark) M1. (a) C = A/d C1 15.6 nF or 16 nF A1 2 (b) (i) 2.4 × 109 (V) B1 1 (ii) ½ CV2 (or ½QV if attempt to calculate Q made) C1 4.3–5.0 × 1010 J A1 2 (iii) 36–40 C B1 1 (c) recognition that 1% of charge or voltage remains C1 any appropriate form of decay equation (either exponential or logarithmic) C1
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