Embibe Experts Solutions for Chapter: Electromagnetic Induction, Exercise 4: BEGINNER'S BOX - 4

In a circuit a coil of resistance $2\Omega ,$ then magnetic flux changes from $2.0 Wb$ to $10.0 Wb$ in 0.2 sec. The charge flow in the coil during this time is :-

A circular loop of radius 2cm, is placed in a time varing magnetic field with rate of 2T/sec. Then induced electric field in this loop will be :-

The value of self inductance of a coil is $5 \mathrm{H}$. The value of current changes from $1 \mathrm{A} \text{to} 2 \mathrm{A} \text{in} 5 \mathrm{s}$, then value of induced emf in it is,

A coil of self inductance $2 \mathrm{H}$ carries a $2 \mathrm{A}$ current. If direction of current is reversed in $1 \mathrm{s}$, then induced emf in it is,

For a coil having $L=2 \mathrm{mH}$, current flow through it is, $I=t^2{e}^{–\mathrm{t}}$. Then, the time at which emf becomes zero is,

A solenoid has a self inductance of $2 \mathrm{H}$. If the length of the solenoid is doubled having turn density and area constant, then new self inductance is,

A solenoid is wound over a rectangular frame. If all the linear dimensions of the frame are increased by a factor $3$ and the number of turns per unit length remains the same, the self inductance increased by a factor of,

A coil has inductance of $2 \mathrm{H}$ has a current of $5.8 \mathrm{A}$. The flux, in weber, through the coil is,