# crazy physics question.. tough one

#### synapse

##### Senior Member
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hey guys. can u figure this out? i don't get it..

A charge Q = -10-6 C is moving at a speed of 10,000 m/s through a magnetic field. If the field B = 3 Tesla, what is the largest possible magnetic force on the charge?

F = ?

#### firebird69guy

10+ Year Member
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synapse said:
hey guys. can u figure this out? i don't get it..

A charge Q = -10-6 C is moving at a speed of 10,000 m/s through a magnetic field. If the field B = 3 Tesla, what is the largest possible magnetic force on the charge?

F = ?

F = QvBsin(theta)

so... 10 x 10,000 x 3 x sin 90

= 3 x 10^5 N

That's my guess.

#### Parscope

##### Junior Member
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synapse said:
hey guys. can u figure this out? i don't get it..

A charge Q = -10-6 C is moving at a speed of 10,000 m/s through a magnetic field. If the field B = 3 Tesla, what is the largest possible magnetic force on the charge?

F = ?
F = qvBsin(@)

In order to get the largest possible force, the charge would have to be moving perpendicular to the B field, so F = qvB.

F = (.000001 C)(10,000 m/s)(3 T) = .03 Newton

#### Shrike

##### Lanius examinatianus
10+ Year Member
Par is right, unless I'm missing something; firebird, you misread the problem (which was easy to do): it was 10^(-6) coulombs. Remember, a Coulomb is a lot of charge.

The charge was given as negative, so either use left hand rule or switch the RHR answer once your done, whichever you promise to remember unfailingly.

#### Daichi Katase

##### Senior Member
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hmmmmmm.....it does say coulomb unless sleep deprivation is catching upto me.

#### Turkeyman

##### Trickster Poultry
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DetectiveChubby said:
hmmmmmm.....it does say coulomb unless sleep deprivation is catching upto me.
Yeah that's what Shrike said, 10^-6 coulombs =D

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Oh