Question

1. An electron moves with velocity of 6.0x10⁶ m/s perpendicular to a magnetic field facing out of the page. The circular path of the electron has radius of 3 mm. (a) draw sketch of the magnetic field and path of electron. Determine (b) the magnitude of the B field, (c) acceleration of the electron (m_e= 9.11x10^-31 kg, e=60x10^-19 C).
2. When a magnetic flux through 5 loops of wire increases by 30.0 T.m², an average current of 40.0 A is induced in the wire. Assuming that the wire has a resistance of 2.5 ohms, (a) over what period of time did the flux increases? (b) If the area of the loop is 0.08 m², perpendicular to the magnetic field and the flux change is only due to change of magnetic field, how much the field changes during this time period ?
3. A metal airplane with a wingspan of 30.0 m flies horizontally along a north-south route in the northern hemisphere at a constant speed of 320.0 km/h in a region where the vertical component of the Earth’s magnetic field is 5.0 x10^-5 T. (a) What is the magnitude of the induced emf between the tips of the wings. (b) If the easternmost wing tip is negatively charged, is the plane flying due north or due south, explain?

Answer 1