Question:- Andy has a cube edge length 8 cm. He paints the outside of the cube red and then divides the cube into smaller cubes, each of edge length 1 cm. Andy randomly chooses one of the unit cubes and rolls it on a table. If the cube lands so that an unpainted face is … Read more
Question 3:- A restaurant sells three sizes of drinks: small for $1.20, medium for $1.30 and large for $1.80. Each person at a table of ten ordered one drink, for a total cost of $14.90, before sales tax. How many people ordered a large drink ? Solution:- Let number of small sizes drink = s … Read more
Question 2:- The length of a rectangle is three times its width. A new rectangle is created by decreasing the length of the original rectangle by 9 feet and increasing its width by 4 feet. The area of the new rectangle is the same as the area of the original rectangle. What is the perimeter … Read more
Question 1:- A streaming video service offers its customers two plans. The first plan has a $ 24 registration fee, a fixed monthly rate of $5 and a charge of $0.75 for each video download. The second plan has a $15 registration fee, a fixed monthly rate of $3 and a charge of $1.50 for … Read more
Case study question of Physics – Electrostatic potential and capacitance Case study 3:- A dielectric slab is a substance which does not allow the flow of charges through it but permits them to exert electrostatic forces on one another. When a dielectric slab is placed between the plates, the field polarises the dielectric. This induce … Read more
Case study question of Physics – Electrostatic potential and capacitance Case study 2:- This energy possessed by a system of charges by virtue of their positions. When two like charges lie infinite distance apart, their potential energy is zero because no work has to be done in moving one charge at infinite distance from the … Read more
Case study 1:- The potential at any observation point P of a static electric field is defined as the work done by the external agent (or negative of work done by electrostatic field) in slowly bringing a unit positive point charge from infinity to the observation point. Figure shows the potential variation along the line … Read more
Case study question of Physics – Electric charges and field Case study 5:- Surface charge density is defined as charge per unit surface area of surface charge distribution i.e., σ = dq/ds. Two large thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of … Read more
Case study question of Physics – Electric charges and field Case study 4:- When electric dipole is placed in uniform electric field, its two charges experience equal and opposite forces, which cancel each other and hence net forceon electric dipole in uniform electric field is zero. However, these forces are not collinear, so they give … Read more
Case study question of Physics – Electrostatic potential and capacitance Case study 4:- Potential difference (ΔV) between two points A and B separated by a distance x in a uniform electric field E is given by ΔV = -Ex, where, x is measured parallel to the field lines. If a charge moves from P to … Read more