ताल पत्ता लगाउनुहोस् the mass of water displaced by the piece of stone. (Ans: 3 NI
42.) एउटा ठोस वस्तुको तौल हावामा 2375 N छ र यसलाई 0.9 gm/cm'
वनत्त्व भएको तरलमा पूर्ण रूपमा डुबाउँदा यसको तौलको नाप 125 N हुन्छ
भने हिसाब गर्नुहोस्।
(A solid weights 2375 N in air and 125 N when totally
immersed in a liquid of density 0.9 gm/cm'. Calculate):
a) ठोस वस्तुको घनत्त्व निकाल्नुहोस् । The density of solid.
b) उहि ठोस वस्तुलाई अर्को घनत्त्व भएको तरल पदार्थमा डुबाउदा
यसको आयतनको भाग तरल पदार्थको सतहमा उत्रन्छ भने सो
तरलको घनत्त्व निकाल्नुहोस् । The density of next liquid in
which the same solid would float with one-fifth of its
volume exposed above the level of liquid.
[Ans: d = 950kg/m d = 1187.5kg/m')]​

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia