1) Electric field strength is defined as the... a) Force per unit positive charge b) Force per unit negative charge c) Force per unit potential difference d) Shocking meadow power 2) Electric field strength between two parallel charged plates increases if .... a) The potential difference across them is decreased b) Charged particles are passed between the plates at a higher velocity c) The distance between the plates is reduced but the plates are made shorter by the same amount d) A magnetic field is applied at right angles to the field e) Someone cuts more holes in the plates for the field line arrows to come out 3) Which particle is this most likely to be? a) Proton b) Neutron c) Electron d) Positron e) Neutrino f) Ball of carrot jam 4) What is x, the distance travelled by the electron before hitting the plate if d = 30 cm, the p.d across the plates is 10kV and the initial horizontal velocity of the electron is 3 million m/s? (it starts exactly halfway between the plates) a) 7.5 cm b) hairy bison c) 2.1 cm d) 12.4 cm e) 14.2 cm f) 9.6 cm 5) Which direction do the field lines flow in this picture if the current flows down the sides of the coil that can be seen? a) Right b) Left 6) Which direction does the current that created this force flow in the wire? a) Up b) Down 7) A wire of length 40cm is placed in a field of flux density 0.15 T. The wire is angled at 60 degrees to the field lines and carries a current of 2 A. What is the force exerted on the wire? a) 0.12 N b) 0.10 N c) 0.20 N d) 0.15 N e) Gilbert 8) The picture shows an electron forming a circular path in a magnetic field. What is the radius of the path if the velocity of the electron (shown by the red arrow) is 20 million m/s? a) 4.6 mm b) 3.1 mm c) 17 mm d) 21 mm e) Big 9) The direction of any induced current is in a direction that opposes the flux change that causes it a) Faradays law b) Weber c) Lenz's law d) Gilberts logs e) Tesla 10) Which of these will not increase the size of the E.m.f induced across a coil? a) Using a stronger magnet b) Using a coil with more turns c) Use a coil with a larger cross-sectional area d) Move the magnet faster e) Move the coil closer to the magnet 11) A step-up transformer has a primary coil with 100 turns. It transforms the mains voltage of 230 V a.c. to 11500 V a.c. How many turns must there be on the secondary coil? a) 2000 b) 4500 c) 10000 d) 5000 e) robots in disguise 12) All three capacitors have a capacitance of 30 micro Farads and the p.d across C1 is 5 V. What is the total charge stored by all 3 capacitors combined? a) 0.00015 C b) 0.00020 C c) 0.030 C d) 0.0025 C 13) Time constant of a discharging capacitor is ...... a) Time taken for charge stored to drop by 1/e of original value b) Time taken for charge stored to drop to 1/e of origianl value c) When time stops and an evil wizard kills some emus 14) Beta plus decay is when a ....... and ......... is emitted a) positron antineutrino b) positron neutrino c) electron antineutrino d) electron neutrino 15) Why is iron at the top of this graph? a) It requires most energy to split it into constituent parts b) It requires least energy to split it into constituent parts 16) A nuclei with a high binding energy also..... a) Is more likely to fission b) Is less likely to fission c) Is more likely to have a ride on Terry the horse d) Is less likely to have a ride on Terry the horse

Ocr frontiers of physics G485 A2 quiz

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