Physics Section 15


  • The direction of an electric field is the direction of the force a positive test charge would experience.
  • The electric field inside a charged conductor is zero.
  • The capacitance of a parallel plate capacitor increases with the plate area.
  • The SI unit of capacitance is the farad (F).
  • Dielectric materials increase the capacitance of a capacitor.
  • The charge stored in a capacitor is directly proportional to the potential difference across its plates.
  • An electron and a proton have the same magnitude of charge.
  • The direction of an electric field is defined as the direction of the force that a positive test charge would experience if placed in the field.
  • Electric field lines never cross each other.
  • The direction of an electric field at a point is the direction of the force that a positive test charge would experience if placed at that point.
  • Electric field lines emerge from negative charges.
  • The work done in moving a charge in an electric field depends only on the initial and final positions of the charge.
  • The energy stored in a capacitor increases with the square of the potential difference across its plates.
  • A positively charged body has a deficit of electrons.
  • The property of a material due to which it opposes the flow of electric current through it is called resistance.
  • Electric potential at a point is the work done in bringing a unit positive charge from infinity to that point.
  • The magnitude of an electric field is the force experienced by a unit positive charge placed in the field.
  • The potential difference between two points is the work done in moving a unit positive charge from one point to another.
  • The work done in moving a charge perpendicular to the electric field is zero.
  • The electric field due to a point charge is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance from the charge.
  • The direction of the electric field at a point is the same as the direction of the force that a positive test charge would experience if placed at that point.
  • The direction of the electric field inside a conductor is from higher potential to lower potential.
  • The electric field inside a conductor is zero when it is in electrostatic equilibrium.
  • The capacitance of a capacitor depends on the area of the plates, the distance between them, and the permittivity of the dielectric material between them.
  • The energy stored in a capacitor is given by the formula U = 0.5CV^2.
  • The energy stored in a capacitor increases with the square of the potential difference across its plates.
  • The capacitance of a parallel plate capacitor is directly proportional to the area of the plates and the permittivity of the dielectric material, and inversely proportional to the distance between the plates.
  • The unit of electric field strength is N/C (newtons per coulomb).
  • The electric field between two oppositely charged parallel plates is uniform.
  • The direction of the electric field lines inside a capacitor is from the positive plate to the negative plate.
  • The electric field inside a conductor is zero because charges in a conductor rearrange themselves in response to an external field to neutralize it within the conductor.
  • The capacitance of a capacitor is a measure of its ability to store electric charge.
  • The dielectric material between the plates of a capacitor increases its capacitance by reducing the electric field between the plates.
  • Electric field lines originate on positive charges and terminate on negative charges.
  • The potential difference between two points in an electric field is the work done per unit charge in moving a positive test charge from one point to the other.
  • The electric field strength at a point is the force experienced per unit positive charge placed at that point.
  • A dielectric material increases the capacitance of a capacitor by reducing the potential difference across the plates for a given amount of charge.
  • The work done in moving a charge along an equipotential surface is zero.
  • The electric field inside a conductor in electrostatic equilibrium is zero, and the electric field just outside the conductor’s surface is perpendicular to the surface.
  • A parallel plate capacitor with air as the dielectric material has a larger capacitance than the same capacitor with a dielectric material between its plates.
  • Electric field lines are always perpendicular to equipotential surfaces.
  • Electric field lines cannot cross because the direction of the electric field at any point is unique.
  • The electric field inside a conductor is zero, and excess charges reside on its surface in electrostatic equilibrium.
  • The capacitance of a parallel plate capacitor is directly proportional to the area of the plates and the permittivity of the dielectric material, and inversely proportional to the distance between the plates.
  • The potential difference between two points is the work done per unit charge in moving a positive test charge between the points.
  • The unit of electric field strength is volts per meter (V/m).
  • Electric fields can interact with matter by exerting forces on charged particles within the matter.
  • Electric field lines that are closer together indicate a stronger electric field.
  • The electric potential at a point in an electric field is the electric potential energy per unit charge.
  • The electric field inside a conductor’s surface is always perpendicular to the surface in electrostatic equilibrium.
  • The acceleration produced in a rotating body is due to a change in direction.
  • Gravitation force of Earth is 9.80 m/s².
  • Gravitation force of the Sun is 274 m/s².
  • Gravitation force of the Moon is 1.62 m/s².
  • A force applied on a body through a string is called tension.
  • The instrument suitable to measure the internal diameter of a test tube is Vernier Callipers.
  • The efficiency of the Carnot engine working between 150°C and 50°C is 23.6%.
  • The unit of capacitance is the farad.
  • The speed of light is minimum while passing through glass.
  • A stone thrown from the top of a tall building follows a parabolic path.
  • A force on a particle is conservative if its work depends on the endpoints of every motion, not on the path between.
  • Electric current in a solid metal conductor is caused by the movement of electrons.
  • The process in which entropy remains constant is isochoric.
  • The core of a transformer is laminated to reduce energy losses due to eddy currents.
  • The value of self-inductance is 5 mH.
  • Two parallel beams of positrons moving in the same direction will repel each other.
  • The resistance of copper decreases, and that of germanium increases when cooled from room temperature to 77 K.
  • The process in which entropy remains constant is isochoric.
  • The electrostatic potential energy of a system increases when bringing an electron towards the second electron.
  • When light passes through a lens, it undergoes a change in direction called Refraction.
  • The SI unit of electric charge is Coulomb.
  • The process of a gas changing directly into a solid without passing through the liquid phase is Deposition.
  • The process of energy production in the Sun through nuclear fusion is Fusion.
  • The process of using controlled nuclear reactions to release energy is Nuclear power.
  • The force experienced by a current-carrying conductor in a magnetic field is Magnetic force.
  • The process of splitting an atomic nucleus into smaller fragments is Nuclear fission.
  • The process of converting alternating current (AC) to direct current (DC) is Rectification.

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