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electromagnetism question

Hi,

I have a question:
Q = 1x10^6 C
r = 1.5^11m
v = 30 km/s

I have to find B.

Anyone have any ideas?

Thanks.
Don't u know the mass? What's the actual question
Have you got a mass?
i'm guessing mv^2/r=BQV

giving B =mv/rq

you haven't got 'm' so you could hardly calculate 'B' :s:
Reply 4
Avatar for matt2minger
matt2minger
OP
1
the actual question is:

Assume the earth has a charge of 1x10^6, find the B field at the sun due to the motion of the earth, given that the earths velocity relative to the sun is 30 km/s and the radius of the earths orbit is 1.5x10^11.

The answer is 1.33x10^-19T, but i could only get 1.33x10^-17T
Reply 5
Avatar for matt2minger
matt2minger
OP
1
there is no mass for earth or sun in the past exams paper either
matt2minger
the actual question is:

Assume the earth has a charge of 1x10^6, find the B field at the sun due to the motion of the earth, given that the earths velocity relative to the sun is 30 km/s and the radius of the earths orbit is 1.5x10^11.

The answer is 1.33x10^-19T, but i could only get 1.33x10^-17T


Check you've converted everything into standard units such metres , it looks like you've made a fairly simple error as you're a couple of orders out.
Reply 7
Avatar for 0le
0le
21
matt2minger
the actual question is:

Assume the earth has a charge of 1x10^6, find the B field at the sun due to the motion of the earth, given that the earths velocity relative to the sun is 30 km/s and the radius of the earths orbit is 1.5x10^11.

The answer is 1.33x10^-19T, but i could only get 1.33x10^-17T


Show us your working. You probably made a mathmatical error with the powers.
How did u get 1.33 x 10^-17

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