PHY 2092 PRE-LAB WORKSHEET Experiment 8 The Earth's Magnetic Field Date: 10/ 2214 Section # Abahan Name: he diagrams below show a segment of wire either above or below the face of a hiking compass. ASsume the wire continues in both directions and connects to a power supply. The short arrow next to the wire gives the direction of the current in the wire. Draw magnetic field lines produced by the current in the wire. 1) Draw an arrow on the face of the compass to indicate the direction the North-seeking end of a compass needle will point in each situation. Assume the magnetic field created by the current is the same strength as the Earth's magnetic field and the equipment is located on the Earth. 2) N W W E S N N W Е S S 8 -1

Electric and magnetic interactions

Use: μ= 4T x 10-7 Hm-¹, electron charge = -1.6x10-1⁹ C Question A narrow beam of electrons was directed at a speed of 2.9 x 107 m s-1 into a uniform magnetic field. The beam followed a circular path of radius 35 mm. a) Calculate the flux density of the magnetic field (mass of an electron = 9.1 x 10-³1 kg) b) If the speed of the electrons in the beam was halved, what effect would this have on the radius of curvature of the beam in the field? Justify your answer.