# A few questions you might be able to help me with

Hi all,
First time user of this forum so please be gentle with me. Im 4 weeks into a 3 year degree as a radiographer. Radiation physics is a subject thats giving me grief so Ive got some questions that I hope you can help me with. I'll crack on..................If you could show me the relevant formulas and workings i will be eternally grateful.

1a) After sliding across an X-ray couch and standing up, a patient is found to have a negative static charge of 1.37nC. Calculate the positive static charge of X-ray couch. Explain your reasoning.

1b) Calculate the force between patient and couch if the are 1m apart.

2a) Xray exposure is made with settings of 85Kvp, 320 mA and 20ms, Calculate the total charge transferred from cathode to anode

2b)Calculate the work done on the electrons

3) 2 Objects charged and placed 1m apart. They experience a force of 10.5N. Calculate Force between charged bodies if they are to be moved 500mm apart.

In previous studies I've thrived by being given an example with workings and then Im able to replicate with future questions. The lecturer in question believes that because its a level 5 course that we should be more investigative so we're only given questions with no answers. So we dont really know when we've tackled questions - if theyre right or wrong !!. Anyway - hope you canhelp with any of the above. Apologies if I've got the forum procedure wrong...

[