Q1. Two long, straight parallel wires 10.6 cm apart carry currents of equal magnitude I.
The parallel wires repel each other with a force per unit length of 2 nN/m.
The permeability of free space is 4 × 10-7 T • m/A. Find I. reply in units of mA.
Q2. Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 27.7 cm) 22.4 cm away from an object. Discover the image distance.
Answer in units of cm
Q3. A 4.70 kg mass causes a vertical spring to stretch 0.850 meters. The spring is after that stretch and extra 0.270 meters and release (as a stopwatch starts) causing the spring and mass to oscillate.
What is the greatest velocity of this mass? Using the equations
T=1/f and Vmax=2πA/T