Electric Force, Field, and Potential
Which experiment confirmed the existence of electric forces acting at a distance?
Coulomb's torsion balance experiment
Rutherford's gold foil experiment
Millikan oil-drop experiment
Young's double-slit experiment
What effect does increasing enthalpy have on a chemical reaction at constant pressure and temperature?
The reaction releases heat into its surroundings (exothermic)
Temperature automatically increases even if stated as constant initially
There's no effect; enthalpy doesn't affect reactions at constant conditions
The reaction absorbs heat from its surroundings (endothermic)
What happens to an alpha particle when it enters perpendicularly into a uniform magnetic field?
It follows a circular path due to experiencing constant perpendicular force.
It follows a parabolic trajectory similar to projectile motion under gravity.
Its speed increases linearly because of continuous acceleration from the magnetic force.
It continues in straight-line motion because no net force acts on it.
What happens when you double both capacitance & switching frequency within RC low-pass filter?
Doubling reduces cutoff frequency leading less attenuation high frequencies doubling causes greater signal loss above original cutoff frequency.
Doubling leads directly doubled cutoff frequency resulting better high-frequency response without changing .
Increasing both parameters results unchanged overall filtering effect since changes cancel out.
Decreasing capacitance increasing switching frequency simultaneously improves performance maintaining same level filtration.
What will happen if two identical positively charged spheres are partially submerged in oil (a medium with higher dielectric constant than air) instead of being completely surrounded by air?
The gravitational attraction between them dominates over electrostatic repulsion.
The electrostatic repulsion between them decreases.
The electrostatic attraction between them increases.
The electrostatic repulsion between them remains unchanged.
Which rule determines the direction of the electromagnetic force on a positive charge moving in a magnetic field?
Right-hand rule
Bernoulli’s equation
Left-hand rule
Pascal’s principle
What experimental procedure could most precisely determine differences in electrical field strength caused by various dielectric materials inserted between parallel plate capacitors without introducing significant systematic errors?
Measuring capacitance change via LC resonance frequency shift when different dielectrics are placed between calibrated parallel plates connected in a circuit with known L value.
Recording time taken for small test charges released near positive plate surface to traverse set distance influenced by distinct dielectric media using high-speed camera analysis.
Comparing deflection angles of electron beams passing through varying dielectrics situated within homogeneous capacitor fields measured by fluorescent screen markings.
Monitoring potential difference across capacitor plates with high-resolution voltmeter as several dielectrics are swapped sequentially under constant charge conditions.

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Which statement best describes relationship between magnetic flux linkage L coil number turns N around ferromagnetic core carrying alternating I?
Since inversely proportional remains same regardless varying unless core saturation reached affecting permeability.
As increases proportionally increases provided stays constant given material's properties remain stable
Decreases linearly opposite direction compared keeping magnitude change uniform throughout operation range
Increases exponentially respect decreasing rapidly once reaches critical level causing nonlinearity behaviour
If you want to reduce the electric force between two point charges, what should you do?
Increase their distance from each other
Coat one charge with insulating material
Convert one charge into neutral particles
Add more charges between them
How can an experiment be designed to measure the electric force on a charged oil droplet in air, accounting for gravitational and buoyant forces, to determine the elementary charge?
Placing charged oil droplets in a uniform magnetic field and measuring their radius of curvature via Lorentz force.
Using Millikan’s oil-drop apparatus adjusted for barometric pressure with precise voltage control across parallel plates.
Employing a simple pendulum setup where charged oil droplets swing under electric influence with minimal friction.
Observing the motion of charged oil droplets between capacitor plates using an alternating current source to vary the electric field.