Recent content by Ruitker

I have the correct answer, my calculator was in degrees instead of radians :( i can't believe i didn't notice for a while. Thanks for all of your help.

So, it would be j^. I would include the negative sign in the answer.

I've come up with this: B = -(μ*I)/(∏*w) * (arctan(w/2a)) Is this correct?

This was the image we were given: http://imgur.com/QJ0rEmH

I'm sorry, i have no idea what I am doing. I entered an answer to the online homework grader but it was wrong. It doesn't give me a solution either :/. What equation should i have used?

Would these be correct then? Limits of +0.06 and -0.06 => ∫(μI)/(2∏w)*(dr/r) == (μI)/(2∏a)ln(w/2) ? It can't be because can't evaluate ln(-w/2)

I tried this: S we have B times the closed integral of ds (the B is taken out of the integral because the magnetic field is uniform at the circumference of our circle we drew as that is the amperian loop) which is equal to nu times the enclosed current. The closed integral of ds would just be...

Thanks for your help. I am still confused how to form the integral.

Homework Statement An infinitely long thin metal strip of width w=12cm carries a current of I=10A that is uniformly distributed across its cross section. What is the magnetic field at point P a distance a=3cm above the center of the strip? Homework Equations dB = (μ0*dI)/(2*∏*r) The...

Thanks for your suggestions. I am not sure i understand what you mean. Shall i calculate the velocity and then convert to angular velocity or is there a trick i am missing.

Homework Statement A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= 250 g and length l= 25...

So in this instance, how would the formulae change?

What difference does it make if it is above the centre of mass?

Homework Statement A yoyo of mass m=2 kg and moment of inertia ICM=0.0625 kg m2 consists of two solid disks of radius R=0.25 m, connected by a central spindle of radius r=0.1875 m and negligible mass. A light string is coiled around the central spindle. The yoyo is placed upright on a flat...