Physics Answers

If the relative error is measuring an area of 320 m² was 0.03, calculate the absolute error for that Measurement

11. The e.m.f. of an element is 6 V. When the external resistance is 1.1 Ohm the current in the circuit is equal to 3 A. Find the potential drop inside the element and its resistance.

13. A capacitor with a capacitance of 20 mkF is charged to a potential of 100 V. Find the energy of this capacitor.

Find the capacitance of the Earth. The radius of the Earth is 6,400 km. By how much will the Earth's potential change if it receives a quantity of electricity equal to 1 C?

A ball with a mass of 1 gramme and a charge of 10^-8 C moves from point A whose potential is 600 V to point B whose potential is zero. What was the velocity of the ball at point A if at point B it is 20 cm/s?

What force does the electric field of a charged infinite plane act with on each metre of a charged infinitely long filament placed in this field? The charge linear density on the filament is 3x10^- 8 C/cm and its surface density on the plane is 2x10^-8 C/cm2.

What force does the electric field of a charged infinite plane act with on each metre of a charged infinitely long filament placed in this field? The charge linear density on the filament is 3x10- 8 C/cm and its surface density on the plane is 2x10-8 C/cm2.

The increase in the volume of 10cm³ of mercury when the temperature rises by 100^oc is 0.182cm^3. What is the cubic expansivity of mercury?

In a workshop,one end of a chain is attached to a wall and the other end to an engine of mass of 400kg. A rope is also attached to the engine at the same point and a force is applied in order to lift the engine. To keep the engineat restin the position shown in the diagram a force F must be applied. Write down the resultant force on the engine where force a F is applied so that the engine is stationary

The coordinate-free form of electric field at an arbitrary point P (a distance r away). of an electric dipole located at the origin is E(r)= 1 4 pi epsilon 0 [ 3(p.r) r^ 3 r- p r^ 3 ] Convert this into an expression in spherical coordinales.