Class 12th

$\Delta T_f=0.2°C$

$m=\frac{0.7*1000}{93*42}=\frac{700}{93*42}=0.179m$

$\Delta T_f=i{K}_{f}m$

$i=\frac{\Delta T_f}{K_f*m}=\frac{0.2}{1.86*0.179}=0.6$

$\frac{\alpha }{2}=1-0.6=0.4$

$\therefore \alpha =0.4*2=0.8$

% of = 80%

${?}_0=h{\upsilon }_0$

$=6.6*10^{-34}*1.3*10^{15}J$

$=8.58*10^{-19}J$

$l_g=nk$

$l_{g}G=\left(l-l_g\right)s$

$\Rightarrow nkG=\left(l-nk\right)s\Rightarrow l=\frac{nkG}{s}+nk=nk\frac{\left(G+s\right)}{s}$

$l=\frac{nk}{s}\left(G+s\right)$

Kindly go through the solution

Based on theory

B_v = 6 * 10^-5 T

B_v = B_N sin37°

$\therefore B_N=\frac{B_v}{sin37°}=\frac{6*10^{-5}}{3/5}=10^{-4}T$

We know, R = R_oA₃₌

_{$\Rightarrow \frac{R}{R_O}=A^3$}

Taking log both side

$lo{g}_e\left(\frac{R}{R_O}\right)=3logA$                

$\lambda =\frac{h}{mv}=\frac{h}{\sqrt[]{2mk.E}}$

$\lambda \alpha \frac{1}{\sqrt[]{m}}$

$m_{\alpha }>m_n>m_p>m_e$

${\lambda }_{\alpha }<{\lambda }_n<{\lambda }_p<{\lambda }_e$  

A ring magnet is a type of strong and permanent magnet which is made from the alloy of iron, boron and neodymium. These are the part of rare-earth magnet family which is the reason behind their the strongest magnetic properties amongst all other permanent magents.

A U-shaped magnet is another type of bar magnet. This is known as a horseshoe magnet since its shapes resembles the object called horseshoe. The two ends of this U-shaped magnet are its magnetic poles. Configration of these magnetic poles creates a concentrated magnetic field. This concentrated magnetic field makes it much more stronger than a simple and straight bar magnet.