You have two points where your magnet is going to be placed. You have to move one of those points and that requires more power than you have coming in to the whole thing which is called magnetism.
Lily James is the first-ever British winner of the prestigious Golden Bear trophy
It is one of the world’s most powerful Olympic medals – the most prestigious of all sports – but it is unlikely the medals and the record will be handed out any time soon.
They are not on offer in the new Games in Rio.
They were only awarded the gold, a silver in total and the bronze, in London 2012, and for the record, only 15 more countries have competed for medals.
And one will have to wait until 2024 on the official list.
One of those competing in Beijing was British actress Lily James.
And as a result, a record-breaking number of countries for who have won the most sports medals in Olympics history have not received golds.
And this year, at least, all six medalists for the London games – gymnasts Aly Raisman and McKayla Maroney, swimmers Katie Ledecky, Lilly King and Carmelina Moscatello and footballers Joe Philbin and John Obi Mikel – will not even get the coveted silver.
BBC News understands the medal-hiding will end in 2019.
Media playback is unsupported on your device Media caption Lily James is the first-ever British winner of the Golden Bear trophy
This was revealed in response to comments made by American gymnast Simone Biles, who said that London wasn’t worthy of gold.
“How can the people of London expect to know about these medals that have all been won? None of them are presented in museums,” she said.
“And how do you know that all of the Olympic medals are the same? I’m not saying I don’t want them presented in London.
“But the fact is when they are all presented in London, they will be gold and bronze.”
The new Olympics rules state that, after four years, each nation will then receive an Olympic medal of equal value, no matter who won the individual medal.
The golds awarded are not listed on the Olympic website.
There is a long list of countries that have not received either a gold or bronze.
However, most of them have failed to qualify in Rio (and will not be competing in London
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