All the schools have NCERT books into their curriculum and no other book is recommended. The first preference for any exam is NCERT books be it your board exams, medical entrance exams or the most prestigious UPSC exams. We have tried to provide the most suitable and relevant solution to the students which are easy … Read more
Question 12.1: Choose the correct alternative from the clues given at the end of the each statement: (a) The size of the atom in Thomson’s model is ………. the atomic size in Rutherford’s model. (much greater than/no different from/much less than.) (b) In the ground state of ………. electrons are in stable equilibrium, while in ………. electrons … Read more
Question 11.1: Find the (a) maximum frequency, and (b) minimum wavelength of X-rays produced by 30 kV electrons. ANSWER: Potential of the electrons, V = 30 kV = 3 × 104 V Hence, energy of the electrons, E = 3 × 104 eV Where, e = Charge on an electron = 1.6 × 10−19 C (a)Maximum frequency produced by the X-rays = ν The energy of the electrons is given by the relation: … Read more
1.(a) Figure 8.6 shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15A. Calculate the capacitance and the rate of change of potential difference between … Read more
Question1.1: What is the force between two small charged spheres having charges of 2 × 10–7 C & 3 × 10–7 C placed 30 cm apart in air? Solution1.1: Given: Q1= 2 × 10-7 C Q2 = 3 × 10-7 C r = 30 × 10-2 m We know, F = (Q1 Q2)/(4 π εo r2 ) Substituting the given values, we get F = 6 × … Read more
