llowmg statements is correct .VSection8Answer all the questions .1Study the circuit in Fig. 1.1 . 3VSI000 --4700/-lF220QFig.1.1 The switch S is closed to charge the capacitor. When the switch is opened the capacitor discharges through the resistor. Here is a list of values: 1.4 x 10-2 2.1X10-21.01.42.1Choose from the list the value that is closest to (a) the time constant r of the circuit in seconds value .... ...... ......... .. s (b)the charge in coulombs on the capacitor when at a p.d. of 3.0 Vvalue .. ......... .. ........ C (c)the energy stored on the capacitor in joules when at a p.d. of 3.0 Vvalue .. .. .............. ... J 4) the initial value of the current in ampere when the fully charged capacitor discharges through the resistor. value ..... ..... ... ..... . AIfd~:[ 4 ]2(i)Explain the shape of the graph.[2) (ii) On Fig . 12 .2, sketch how the flux linkage of the coil changes with time.[1 ]3)When the magnet spins at 30 revolutions per second, the amplitude of the emf across the 120 turn copper coil is 1.3 V. Estimate the maximum flux in the core.maximum flux = ...................... ..... Wb [2] 3) The amplitude of the emf for a given rotational speed can be increased by using a stronger magnet which increases the flux density in the coil.Describe and explain two other modifications to the device of Fig . 12.1 to increase the 3.mplitude of the emf for a given rotational speed .[3] 4) Explain why the core is made from thin iron sheets glued together rather than being solid iron.[Total: 11:][Turn over1.-4I3 This question is about the possibility of fusion between a tritium nucleus and a deuterium nucleus.A tritium nucleus ~H and a deuterium nucleus ~H approach each other along the same line with the same speed u.~Huu~H- - - 8 8 1 -----..." - 1t-OC---- W Fig. 3.1 1)- -Each nucleus decelerates, comes to rest and then accelerates in the reverse direction. (i) By considering conservation of momentum, explain why both nuclei cannot come to rest at the same time .................................................... .... ..... .. .. ...... ...................... ......................................... [IJ2) When the nuclei are closest together they have the same velocity. Show that this velocity is u15 .[2] (b) (i) Energy is conserved during the interaction. Write a word equation relating th e initial energy of the two nuclei when they are far apart, shou mak to their energy when they are closest togeth er. Your equation ld e clear the kind(s) of energy involved .......... ....... ... ... ........ .................. ............................................................. .. ...................... [1].- --..::..(ii) Show that the total initial kinetic energy of the two nuclei is equal to 4.18 x 10-27 u2 joule where u is in m S-1 .(iii)The potential energy E of two charges 01 and 02 ' separated by a distancer is given by1 2E= EO 4TI--EO= permittivity of free spacerFor ~H and ~H to fuse, their separation must be no more than 1.50 x 10-15 m. Calculate the minimum value of u for fusion to take place.m inim um value of u= .................... ............................m 8-1[S J[Total 9 : ][Turn over60.00.01I0.02 0.03 0.04 0,05 0.06 0.07 0.08! !I !0,09 0.10! !Idistance/mI!!O.020m..;--.----y1 --- -z0.10 m S-l// region of uniform magnetic/vcoil position att == 0field B = 0,032Tvcoil position at t == LOsFig. 4.2(i) Show that the voltmeter reading as the coil enters the field region, after t = 0,20s, is 80 rnV, Explain your reasoning fully,[2 ](ii)On Fig, 4,3, draw a graphbf the voltmeter reading against time for the motion of the coil from Y to Z, Label the y~ axis with a suitable scale, [:3]..!:t" ,'j !J1i [l Ii T ,TT,IHiIiI!I.,II i :Ii, !voltmeter readingTl~JI!iIill iII't"1tJ I.. ~ 1"+IJt 'I1,0ii I, 1.J+..i..j f , ,\'r' 1II i t~.iil... ..iJI Ii!it:I...II_L .Li1'1.tis[T ota !:7 ]!5Forj=xaminer'5g Ar nitro a gen v atom it is y initia . lly stati onar y at point P in 600 V Fig. 5.1 , mid way betw een two large Fig. 5.1 horiz 1) ontal Th paral e dir lel plate ect s in ion of an evac th uate e d ele cha ctri mbe c r. for The ce nitro on gen th atom e beco nit mes ro char ge ged. n Ther ion e is is an ver elect tic ric all field y betw do een wn the wa plate rd s . s. Igno St re at any e effec wit ts of hTa ...... ....... r ... ... e ....... a ..... . s o ... .. n ...... ...... t ... .. h .. .. . e ... .. ...... s .... .. i ... ... g ....... n ... ... o . ..... f ....... ....... t ....... h .. ... e [1]c the instant that t At h and mass 2.3 a r (i) the kinet g e o n t h e i o n . Th (c) e electric separation of (ii)the spee. . . . . . .Useseparati on= ........ ...... .... .. .... .. .. .. .m [1]ForExaminer'sUse(d) The ion passes through a hole in the lower plate at a speed of 6.5 x 104 m S-1. It enters a reg ion of uniform magnetic field of flu x density 0.17 T perpendicularl y into the plane of Fig. 5.2.txx x x xx x x xx x x xx x xx xxx x xx x x xx xxx xx x xxxx-------- magnetic field x . Into the plane of x x the paperFig. 5.2(i) (ii) Sketch on Fig. 5.2 the semicircular path taken by th e ion .[1]Calculate how far from the hole the ion will collide with the plate. Use data from (b).distance= ... ............. .. ... .. ..[Total: 10]m [3]JCY '"[Turn overparticles the synchronisation of the accelerating force with the particle motion the meth od of maintaining the charged particles in a curved path the energies which each machine is capable of imparting to the charged particles (numerical values are not required) the relative advantages of the two types of machine.detecto r alpha particle sourcemagnetic fieldholeha particlesg th as they o from the source to e detector. (ii) State why there must be a vacuum in the tube.[1J[1 ]lide two protons.If the protons have sufficient speed such an event can produce more protons. Explain why high-speed protons are necessa ry for the producti on of more protons .