Embibe Experts Solutions for Chapter: Magnetic Effect of Electric Current, Exercise 1: Maharashtra Board-2020

State and explain what is Ampere's circuital law.

In a cyclotron, magnetic field of $1.4 \mathrm{Wb} {\mathrm{m}}^{-2}$ is used. To accelerate protons, how rapidly should the electric field between the Dees be reversed?

$\left(\pi =3.142, M_p=1.67\times {10}^{-27} \mathrm{kg}, e=1.6\times {10}^{-19} \mathrm{C}\right)$

A cyclotron is used to accelerate protons to a kinetic energy of $5 MeV$. If the strength of magnetic field in the cyclotron is $2T$, find the radius and the frequency needed for the applied alternating voltage of the cyclotron. (Given: Velocity of proton $=3\times {10}^7 \mathrm{m}/\mathrm{s}$).

State the advantages and disadvantages of a moving coil galvanometer.A moving coil galvanometer (M.C.G.) has $10$10 turns each of length $12 \mathrm{cm}$ and breadth $8 \mathrm{cm}$. The coil of M.C.G. carries a current of $125 \mathrm{\mu A}$ and is kept perpendicular to the uniform magnetic field of induction ${10}^{-2} \mathrm{T}$. The twist constant of phosphor bronze fibre is $12\times {10}^{-9} \mathrm{Nm}/\mathrm{degree}$. Calculate the deflection produced.