Magnetic Field
What is the type of field produced around a moving charge or an electric current?
a) Electric field
b) Gravitational field
c) Magnetic field
d) Heat field
c) Magnetic field
In a magnetic field, where are the magnetic field lines stronger according to their arrangement?
a) Where they are farther apart
b) Where they are closer together
c) Where they intersect
d) Where they form loops
b) Where they are closer together
How is the motion of a charged particle characterized when influenced by a magnetic field?
a) Linear motion
b) Uniform motion
c) Centripetal acceleration
d) Tangential acceleration
c) Centripetal acceleration
What does Ampère’s Law state regarding the magnetic field around a closed loop?
a) It is inversely proportional to the current passing through the loop
b) It is directly proportional to the current passing through the loop
c) It is proportional to the area of the loop
d) It is unrelated to the current passing through the loop
b) It is directly proportional to the current passing through the loop
What is the effect on the induction of emf and current when the electromagnet contains zero current?
a) Induction of emf and current occurs
b) No induction of emf and current occurs
c) Only emf is induced, but no current
d) Only current is induced, but no emf
b) No induction of emf and current occurs
What phenomenon occurs when two opposite magnetic poles are placed near each other?
a) Magnetic repulsion
b) Electrical attraction
c) Magnetic attraction
d) Gravitational attraction
c) Magnetic attraction
Magnetic force results from the interaction between:
a) Stationary electric charges
b) Moving electric charges
c) Stationary magnetic charges
d) Moving magnetic charges
b) Moving electric charges
What is the term for the radius of the circular path traversed by a charged particle in a uniform magnetic field?
a) Radius of attraction
b) Radius of repulsion
c) Radius of curvature
d) Radius of acceleration
c) Radius of curvature
What is the mathematical representation of Ampère’s Law?
a.
b.
c.
d.
b) ∫▒〖B∙dl〗=μ_0 I_enc
What is the expression for the magnitude of the magnetic field at the center of a circular loop of radius r carrying current I?
a.
b.
c.
d.
a) \( B = \frac{\mu_0 I}{2r} \)
What are materials called that inherently generate their own magnetic fields?
a) Conductors
b) Resistors
c) Insulators
d) Magnets
d) Magnets
The magnitude of the magnetic force on a moving charged particle is directly proportional to:
a) The magnitude of the electric field
b) The magnitude of the charge only
c) The magnitude of the magnetic field only
d) Both the magnitude of the charge and the magnitude of the magnetic field
d) Both the magnitude of the charge and the magnitude of the magnetic field
What does magnetic flux refer to?
a) The strength of the magnetic field
b) The number of electric field lines
c) The number of magnetic field lines passing through a given surface
d) The distance between magnetic poles
c) The number of magnetic field lines passing through a given surface
How does 1 ampere (A) of electric current relate to the flow of current in a wire?
a) It is equivalent to the electric potential
b) It is equivalent to the resistance of the wire
c) It is equivalent to the electric charge
d) It is equivalent to the electric current flowing in a single 1-meter wire
d) It is equivalent to the electric current flowing in a single 1-meter wire
How does the magnitude of the magnetic field vary at a distance r from a long, straight, current-carrying conductor?
a.
b.
c.
d.
a) \( B = \frac{\mu_0 I}{2r} \)
What term refers to the area around a magnet where the attraction and repulsion of poles are observed?
a) Electric field
b) Gravitational field
c) Magnetic field
d) Heat field
c) Magnetic field
What is the direction of the magnetic force on a negative charged particle moving in a magnetic field, according to the right-hand rule?
a) Same as the direction given by the right-hand rule
b) Opposite to the direction given by the right-hand rule
c) Perpendicular to the direction given by the right-hand rule
d) None of the above
b) Opposite to the direction given by the right-hand rule
What is the unit of measurement for magnetic field?
a) Weber (Wb)
b) Coulomb (C)
c) Tesla (T)
d) Volt (V)
c) Tesla (T)
What happens to the induction of electromotive force (emf) and current when the magnetic field increases as the electromagnet is turned on?
a) Induction of emf and current occurs
b) No induction of emf and current occurs
c) Only emf is induced, but no current
d) Only current is induced, but no emf
a) Induction of emf and current occurs
What is the expression for the magnitude of the magnetic field inside a long cylindrical conductor with radius r carrying current I?
a.
b.
c.
d.
d) \( B = \frac{\mu_0 I}{\pi r^2} \)
How are field lines drawn in a magnetic field to represent the direction of the magnetic field vector?
a) Perpendicular to the magnetic field
b) Tangent to the magnetic field vector
c) Parallel to the magnetic field
d) Diagonal to the magnetic field
b) Tangent to the magnetic field vector
When a charged particle is influenced by a field alone, how is its motion treated?
a) Motion with increasing speed
b) Motion with constant speed and kinetic energy
c) Motion with decreasing speed
d) Motion with variable speed and kinetic energy
b) Motion with constant speed and kinetic energy
How is one Weber (Wb) defined?
a) 1 volt per meter
b) 1 ampere per meter
c) 1 volt-second
d) 1 ohm per meter
c) 1 volt-second
What effect does compressing and decompressing a coil have on the induction of emf and current?
a) Induction of emf and current occurs
b) No induction of emf and current occurs
c) Only emf is induced, but no current
d) Only current is induced, but no emf
a) Induction of emf and current occurs
Who are the scientists credited with pioneering experiments on electromagnetic induction?
a) Michael Faraday and Charles Augustin de Coulomb
b) Michael Faraday and André-Marie Ampère
c) Michael Faraday and Isaac Newton
d) Michael Faraday and Nikola Tesla
b) Michael Faraday and André-Marie Ampère