Two separated, identical conducting spheres X and Y of charge –8 μC and +12 μC respectively, are brought into brief contact and then separated. What is the final charge distribution on X and Y?
A proton of mass mp and charge q is accelerated from rest across a potential difference, V of 5 × 10–2 V. What is the best estimate for the magnitude of the proton’s final velocity, vp?
The Tolman-Stewart experiment sought to find evidence that mobile charge carriers inside conducting metals are negatively charged.
It involved exploiting the inertia of ‘free’ charge carriers in the conductor. If the conductor was suddenly accelerated, a potential difference would be set up.
Assuming positive charges are fixed in place and mobile charge carriers are negative, which of the following statements about the Tolman-Stewart experiment is incorrect?
Accelerating the conductor created an area of excess negative charge in it
Accelerating the conductor created an area of excess positive charge in it
Electrons have inertia
The potential difference created by the acceleration was not measurable
A point charge q is placed near a large spherical charge Q = 10q. What is the magnitude of the force experienced by q and Q and the magnitude of the electric field E created by Q at the position of q?
The electron drift speed in a copper wire of diameter 2.0 mm is 3 × 10–4 m s–1. Typically, the number of free electrons per unit volume for copper is on the order of magnitude 1028 m–3. What is the best estimate for the current in the wire?
Two charges, Q1 = q and Q2 = 4q are separated by a distance r and exert a force of magnitude F on each other. By what factor does the magnitude of the force change if the charge on Q1 doubles and the separation distance trebles?