Give me sime hard numaricals of physics of class 10
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1 the resistance of a wire of length 300 m and cross section area 1.0 mm square made of material of resistivity 1* 10 ^ -7 is
2. calculate the area of cross section of wire of its length is 1 m , it's resistance is 23 ohm and the resistivity is 1.84 * 10 ^ -6
3 find the size , nature and position of image formed when an object of size 1 cm is placed at the distance of 15 cm from a concave mirror of focal length 10 cm
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