### What are the magnitude of the minimum magnetic field

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Q1. Suppose a uniformly charged (with a linear charge density) wire starts at point 0 and rises vertically along the positive axis to a length. Determine the x-component of the electric field at point. That is, compute near one end of a long wire, in the plane perpendicular to the wire.

Q2. A 1700 car travelling at a speed of 13 skids to a halt on wet concrete where = 0.30. How long are the skid marks?

Q3. A particle having mass of 0.200 {rm g} carries a charge of -2.50×10-8 {rm C}. The particle is given an initial horizontal northward velocity of 4.00×104 {rm m}/{rm s}

What are the magnitude of the minimum magnetic field that will balance the earth's gravitational pull on the particle?

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