How does a positive temperature coefficient thermistor work

For the given transistor circuit $V_{BE}=0.7 \mathrm{V}$. Find $I_E$:-

Thermistor is a contraction _________

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

The final value of $I_B$, if $V_{BE}=0.3 \mathrm{V}$ in the given circuit $\left(\beta =100\right)$:

In given circuit if $V_{BE}=0.3 \mathrm{V}$, then the value of $I_B$ will be $\left(\beta =100\right)$

Which of the following is used for the formation of thermistor.

A $NPN$ transistor connected in a common emitter configuration is shown below. If $R_1=8.6 \mathrm{k\Omega }$, $R_2=100 \mathrm{\Omega }$, $V_{BE}=0.7 \mathrm{V}$, $\beta =100$, then calculate $V_{CE}$: