KK NO () EXERCHES IbQuestions 4,5 and 6)
(2) In the formation of a concave mirror, when the object is placed beyond the centre of curvature
de image formed are
() in a converging lens, when the object is at infinity, the images formed are
(4) Light from a narrow slit passes through two parallel slits 0.2em apart, find the wavelength of the
light if the interference fringes on a screen Im from the two slits which are 0.25mm apart
(4) If a 120pl capacitor is charged to a potential difference of 120V before connecting it to another
capacitor, Calculate de capacitance of the second capacitor if the potential difference across it is BOV
(5)A capacitor C-4,5 microfarad is charged to a potential difference of 120V the charger battery)
is removed and de charged capacitor is connected to another uncharged capacitor of value C-6
microfarad. Calculate the energy stored in the original capacitor before connecting to another​

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