ON18 P51 Q2 Charge on Sphere

 9702/51/O/N/18: A  student  is  investigating  the  electric  potential  near  a  charged  metal  sphere.  The  sphere  is  suspended from the ceiling as shown in Fig. 2.1. 

A flame probe is used to measure the potential V at a distance L from the surface of the sphere. The experiment is repeated for different distances from the sphere. It is suggested that V and L are related by the equation 

\(V = \dfrac{Q}{4 \pi \epsilon_0 0(L + a)}\) 

where Q is the charge on the sphere, a is the radius of the sphere and ε0 is the permittivity of free space.

Solutions for October/November 2018 Paper 5 variant 1 question 2 data analysis.

FM18 P52 Q2 Double Slit Interference

 9702/52/F/M/18: A  student  is  investigating  monochromatic  light  passing  through  a  double  slit.  Bright  and  dark  fringes are produced on a screen as shown in Fig. 2.1. 

The distance w between 10 bright fringes is measured. The fringe spacing P between neighbouring bright fringes is then determined.

The experiment is repeated for light of different wavelengths \(\lambda \).

It is suggested that the fringe spacing P and the wavelength \(\lambda \). are related by the equation

\(\dfrac{P}{D} = \frac{\lambda}{s} \)

where D is the distance from the double slit to the screen and s is the slit separation.

Paper 5 variant 2 Question 2 February/March data analysis with gradient, y-intercept, and uncertainty.