A short magnet oscillates with a frequency $10 \mathrm{~Hz}$ where horizontal component of Earth's magnetic…
A short magnet oscillates with a frequency $10 \mathrm{~Hz}$ where horizontal component of Earth's magnetic field is $12 \mu \mathrm{T}$. A downward current of $15 \mathrm{~A}$ is established in a vertical wire placed $20 \mathrm{~cm}$ west of the magnet. The new frequency of the magnet is