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# edexcel PHY 5 question watch

1. a student cyles to college at 12m/s and his metal handlebars are 60cm wide and cut throught the vertical component of the earth's magnetic field. WHY WOULDNT ANY CURRENT flOW THROUGH THE STUDENT WHEN HE TOUCHES THE METAL EVEN IF HE WERE A GOOD CONDUCTOR
2. Perhaps because he is also cutting the earths B-field therefore acts as a ring. The ring therefore would have current trying to flow in 2 different directions, so no current can flow. (Yes that is a guess)
3. Hi NKP.

I think, there will be an induced current in the handlebar. BUT, the student is also a conductor, and a current in exactly same direction will be induced in him since the direction of movement and of magnetic field are same. These two currents will cancel out since in the circuit they oppose each other.

Hope this helps

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EDIT: argh ssmoose got there first
4. I think, there will be an induced current in the handlebar. BUT, the student is also a conductor, and a current in exactly same direction will be induced in him since the direction of movement and of magnetic field are same. These two currents will cancel out since in the circuit they oppose each other.
It's nice to be right instinctively. I knew I should do Physics exams on impulse without revision.

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Updated: June 13, 2006
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