State Lenz's law and hence describe and explain what happens to a magnet travelling through a metal tube
Lenz's law states that the direction of current due to emf induced by a changing magnetic flux is always such that it opposes the change that induced it.
When a magnet travels through a copper tube this induces an emf and current in the tube, this in turn produces a magnetic field which opposes the direction of motion of the magnet. This means the magnet decelerates through the tube.
MC
Related Physics A Level answers
All answers ▸Derive an expression for the centripetal acceleration of a body in uniform circular motion.
How might you use sound waves to smash a glass? What are other examples of resonance in everyday life?
A light wave with wavelength 590nm shines upon a metal and causes it to emit an electron with a speed of 5x10^5 m/s. What is the work function of the metal?
Derive an expression to show that for satellites in a circular orbit T^2 ∝ r^3 where T is the period of orbit and r is the radius of the orbit.