Currently unavailable: for new students
Degree: Engineering (Masters) - Cambridge University
|Further Mathematics||A Level||£24 /hr|
|Maths||A Level||£24 /hr|
|Physics||A Level||£24 /hr|
|-Oxbridge Preparation-||Mentoring||£24 /hr|
|.PAT.||Uni Admissions Test||£26 /hr|
|Before 12pm||12pm - 5pm||After 5pm|
Please get in touch for more detailed availability
Prateek (Parent) November 3 2016
Kiavash (Parent) October 17 2016
Kiavash (Parent) October 8 2016
Benny (Student) February 8 2017
With electostatics, it is important to remember that inthe equation giving the force between two point charges, the force is inversely proportional to the square of the distance of the charges.
It is important to note that with spheres, we will effectively treat them with point charge and hence the distances we will take for our equation is from the centre.
When placed next to each other, the distance between the centres is 2R. Hence if the force decreases by a factor of 9, the distance between the spheres must increase by a factor of 3 (root 9 is 3). Hence the new distance between the spheres is 6R.
However, the question asks for the distance between the surfaces. Hence 2R must be subtracted from our answer, leaving us with the correct answer, 4R.see more
We all know that in general that prices change: we see the price of fuel changing up and down as we see exchange rates. Inflation tries to capture this.
Inflation is defined as an increase in the general level of prices, eroding the value of money.
Inflation is measured using the CPI and RPI indices and mathematically is the percentage change per annum in these price indices.see more