Embibe Experts Solutions for Chapter: Electromagnetic Induction and Alternating Currents, Exercise 1: Level 1

The formula of the induced emf due to rate of change of magnetic flux passing through a coil will be

A long conductor $AB$ lies along the axis of a circular loop of radius $R$. If the current in the conductor $AB$ varies at the rate of $I$ ampere/second, then the induced emf in the loop is

A coil having $200$ turns has a surface area of $0.15 {\mathrm{m}}^2.$ A magnetic field of strength $0.2 \mathrm{T}$ applied perpendicular to this changes to $0.6 \mathrm{T}$ in $0.4 \mathrm{s},$ then the induced emf in the coil is _____ $\mathrm{V}.$

The magnetic flux in a coil is $\varphi =(2t^2+4t+6) \mathrm{mWb}$. Find the voltage (in $\mathrm{mV}$) induced in the coil at $t=4 \mathrm{s}$.

A jet aircraft is flying due to South at $300 \mathrm{m} {\mathrm{s}}^{-1}$ at a place, where the vertical component of the earth's magnetic field is $80 \mathrm{\mu T}$. The potential difference between wingtips, if they are $25 \mathrm{m}$ apart is

In a fluorescent lamp choke $100 \mathrm{V}$ of reverse voltage is produced when the choke current changes uniform from $0.25 \mathrm{A}$ to $0$ in a duration of $0.025 \mathrm{ms}$. The self-inductance of the choke (in $\mathrm{mH}$ ) is estimated to be

For an A.C. circuit at the condition of resonance-

If resonance frequency is $f$ and then the capacity is increased $4$ times, then new resonance frequency becomes-