ANSWER WITH SOLUTION

2. What is the magnitude of the field if a charge of 10 C travelling at a speed of 8 x 10 m/'s in a direction perpendicular to a magnetic field experiences a magnetic force of 8.7 x 10" N? 3. At a certain point on Earth, the horizontal component of Earth's magnetic field is 2.5 x 10"* T due to north. An electron moves eastward with just the right speed, so the magnetic force on it balances its weight. Find the speed of the electron