Magnetic Fields
What is not a consequence of the Biot-Savart Law when used to describe the magnetic field created by an element of current-carrying wire?
The field is zero at a point located on the wire itself.
The field is directly proportional to the current in the wire.
The magnetic field direction depends on the right-hand rule with thumb pointing along current direction.
The field diminishes with inverse cube distance relative to point of interest.
In which scenario would you expect to have greater energy density, considering equal volumes for both configurations?
A magnetic field generated by an electromagnet with high current flow through its coil windings
An electrostatic field near an isolated point charge in open space
An electrostatic field within a parallel plate capacitor with small plate separation
A magnetic field around Earth at sea level
How does increasing the frequency of an alternating current affect the capacitive reactance in a circuit containing only a capacitor?
The capacitive reactance increases linearly with frequency
The capacitive reactance remains unchanged because it only depends on capacitance value not frequency
The capacitive reactance initially increases before decreasing after reaching resonance frequency
The capacitive reactance decreases
If two light bulbs rated at different power levels are wired in series with a battery, which bulb will have a greater potential difference across it?
Both bulbs will have the same potential difference.
Potential difference can't be determined without knowing their resistances.
The bulb with higher power rating.
The bulb with lower power rating.
If two identical capacitors are first connected in series across a battery and then reconnected in parallel with the same battery, how does their stored energy compare before and after reconnection?
The energy stored remains unchanged.
The energy stored after is four times greater than before.
The energy stored after is half that of before.
The energy stored after is twice that of before.
What is the unit of measurement for electric charge in the International System units?
Coulomb
Ampere
Volts
Joule
In a parallel-plate capacitor, if both the plate separation and the potential difference are halved, what happens to the energy stored in the capacitor?
It doubles
It remains unchanged
It decreases by a factor of four
It is halved

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What occurs when a charged rod is brought near one end of an uncharged metallic object while it lies isolated from other objects?
No change in charge distribution occurs until physical contact is made between the rod and metallic object.
The metallic object becomes permanently charged without actual contact with the charged rod.
The metallic object will experience a redistribution of its charges with opposite charges attracted nearer to the rod.
All electrons in the metallic object will flee towards the opposite end of the rod.
What effect does decreasing plate separation have on capacitance and electric potential for a charged parallel-plate capacitor?
It decreases capacitance but increases potential
It increases capacitance but decreases potential
It has no effect on either capacitance or potential
It increases both capacitance and potential
If a coaxial cable with an inner radius 'a' and outer radius 'b' has its dielectric medium's permittivity quadrupled, how does the capacitance per unit length of the cable change?
It is doubled
There is no change
It is quadrupled
It is halved