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November 14, 2007 2:24pm by David Farrar

Who magnetised our coins?

It seems our new coins are magnetic!

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Frank.

No wonder the money doesn’t stick in the taxpayer’s pocket
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November 14, 2007 2:26pm
Pascal

So. Next weekend’s flight over NZ by the alien mothership of Right Wing Business Magnates to hoover all the coins out of innocent NZ’ers pockets is cancelled, is it? Tane will be glad.
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November 14, 2007 2:28pm
anonymouse

from http://www.newcoins.govt.nz/1570749.html

What are the magnetic properties of the new coins?

All the metals used in the new coins are magnetic apart from the copper plating. The magnetic materials used are called “soft magnetic”. This means they do not hold a magnetic field once a magnetising force has been removed. The new coins will not have any affect on credit card magnetic strips in people’s wallets. In technical terms, this gives them a very low “Remanence” and “Retentivity” figure with a very narrow “Hysteresis” loop.

Our old “silver” coins are made of cupro-nickel (75 percent copper and 25 percent nickel).while the New ones are plated steel,
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November 14, 2007 3:07pm
shreddakj

Even though they don’t retain their magnetic field, who wants magnetic coins? The new coins can be picked up easily even with a weak magnet.
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November 14, 2007 3:14pm
Put it away

I found this out yonks ago using while using one as a pick for electric guitar and noticed it stuck to the magnets in the pickup…
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November 14, 2007 3:21pm
Colonel Masters

I cannot find the original reference, but I am sure the police confiscated a magnet in their recent war on terror. It was being used by one of the “terrorists” to store loose change!
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November 14, 2007 4:02pm
bearhunter

I can’t escape the image of Cullen sitting behind a huge, horseshoe-shaped magnet atop the Beehive, rotating slowly as he sucks the country dry…..
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November 14, 2007 4:18pm
scrubone

It’s deliberate – they all have their own “magnetic signature”. I take that to mean that they’ll respond to different magnetic force strengths – handy for vending machines, you just a line of magnets to test which is which.
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November 14, 2007 4:58pm
Dave Mann

God, DPF, you’re slow! The new coins have always been magnetic, you twit… its ‘coz they are plated onto STEEL. Geez….
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November 14, 2007 5:37pm

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