K A Tsokos Solutions for Chapter: Electricity and Magnetism, Exercise 1: Test yourself

In the diagram, the current through the $1.0 \mathrm{mm}$ diameter part of the wire is $1.2 \mathrm{A}$ and drift speed is $2.2\times {10}^{-4}{\mathrm{ms}}^{-1}$. Calculate $\left(a\right)$the  current and $\left(b\right)$ the drift speed in the part of the wire with $2.0 \mathrm{mm}$ diameter.

Silver has $5.8\times {10}^{28}$ free electrons per $m^3$. If the current in a $2 \mathrm{mm}$ radius  silver wire is $5 \mathrm{A}$ Find the velocity with which the electrons drift in the wire ( the charge on the electron=$1.6\times {10}^{-19}\mathrm{C}$

If a current of $10 \mathrm{A}$flows through a heater. how much charge passes through the heater in $1 \mathrm{h}$?

If a current of $10 \mathrm{A}$flows through a heater. how much charge passes through the heater in $1 \mathrm{h}$?

 How many electrons this charge correspond to?

A conducting sphere of the radius $15.0 \mathrm{cm}$has a positive charge of $4.0 \mathrm{\mu C}$ deposited on its surface. Calculate the magnitude of the electric field produced by the charge at distance from the centre of the sphere of $0.0 \mathrm{cm}$

A conducting sphere of the radius $15.0 \mathrm{cm}$has a positive charge of $4.0 \mathrm{\mu C}$ deposited on its surface. Calculate the magnitude of the electric field produced by the charge at distance from the centre of the sphere of $5.0 \mathrm{cm}$

A conducting sphere of the radius $15.0 \mathrm{cm}$has a positive charge of $4.0 \mathrm{\mu C}$ deposited on its surface. Calculate the magnitude of the electric field produced by the charge at distance from the centre of the sphere of $15.0 \mathrm{cm}$

A conducting sphere of the radius $15.0 \mathrm{cm}$has a positive charge of $4.0 \mathrm{\mu C}$ deposited on its surface. Calculate the magnitude of the electric field produced by the charge at distance from the centre of the sphere of $20.0 \mathrm{cm}$