Physics Unit 1 to 5 Test

Unit 1 to 5 (Test) - Physics

• Force between two charged spheres: If two charged spheres are separated by a distance d and exert a force F on each other, doubling the charges and the distance will result in a force of 4F.

• Relationship between electric field and potential: The relationship between electric field (E) and potential (V) is E = -dV/dx.

• Capacitance of a parallel plate capacitor with dielectric: Introducing a dielectric between the plates of a parallel plate capacitor increases its capacitance.

• Unit of electric field: The unit of electric field is N/C (newtons per coulomb).

• Absolute permittivity: The value of absolute permittivity is 8.85 x 10⁻¹² C²/N⋅m².

• Energy stored in a capacitor: The correct expressions for energy stored in a capacitor are 1/2CV² and Q²/2C, where C is capacitance, V is voltage, and Q is charge.

• SI unit of electric flux: The SI unit of electric flux is N⋅m²/C.

• Electric flux on a face of a cube: An electric charge placed at the center of a cube of side a will have an electric flux of q/(ε₀) on one of its faces.

• Kirchhoff's junction rule: Kirchhoff's junction rule is based on the conservation of charge.

• Equivalent capacitance in series: The equivalent capacitance of three capacitors each with capacity C connected in series is C/3.

• Material with highest electrical conductivity: Copper has the highest electrical conductivity among the listed options (copper, aluminum, iron, silver).

• Validity of Ohm's Law: Ohm's law is valid when the temperature of a conductor is constant.

• Specific resistance of a copper rod: The specific resistance of a copper rod is the same compared to that of a thin copper wire.

• Relation between drift velocity and electric field: For an ohmic conductor, the relation between drift velocity (Va) and electric field (E) is Va ∝ E.

• Wheatstone bridge accuracy: A Wheatstone bridge is a more accurate method of measuring resistance because it is a null method.

• Resistance and temperature: Increasing the temperature of a conductor increases its resistance.

• SI unit of resistivity: The SI unit of resistivity is Ω⋅m.

• Lorentz force expression: The expression for Lorentz force is F = q(E + v × B).

• Effect of current direction on parallel conductors: Parallel conductors carrying current in the same direction attract each other.

• SI unit of magnetic field: The SI unit of magnetic field strength is tesla (T).

• Magnetic elements of Earth: Magnetic declination, magnetic inclination, and the horizontal component of the Earth's magnetic field are magnetic elements of the Earth.

• Path of electron in a uniform magnetic field: When an electron enters a uniform magnetic field perpendicularly, its path is circular.

• Ampere's circuital law: Ampere's circuital law states that § B ⋅ dl = μ₀I.

• Maximum force on a current-carrying conductor: The maximum force on a current-carrying conductor in a magnetic field occurs when the angle between the current and the magnetic field is 90 degrees.

• Angle of dip at magnetic equator: The angle of dip at the magnetic equator is 0°.

• Converting a galvanometer to an ammeter: A galvanometer can be converted into an ammeter by connecting a shunt resistor in parallel with the galvanometer.

• Polarity of induced emf: Lenz's law determines the polarity of an induced emf.

• Relation between turns in a step-up transformer: In a step-up transformer, the number of turns in the secondary coil (N₂) is greater than the number of turns in the primary coil (N₁).

• Phase difference in an inductor: The phase difference between the current and voltage in an inductor is 90°.

• Expression for speed of electromagnetic waves: The expression for the speed (v) of electromagnetic waves is 1/√(μ₀ε₀), where μ₀ is the permeability of free space and ε₀ is the permittivity of free space.

• SI unit of mutual inductance: The SI unit of mutual inductance is the henry (H).

• Relationship between turns in different coils of a transformer: The relationship between the number of turns in the primary and secondary coils of a step-up transformer is N₂ > N₁.

• Wavelength of different types of electromagnetic waves: Gamma rays have the shortest wavelength among the listed types (microwaves, UV rays, gamma rays, visible light).