A 10 V
B 2.5 V
C 0.4 V
D 7 V
Explanation: V = IR = 2 x 5 = 10 V.
A Zero
B Equal to external
C Very low
D Infinite
Explanation: Ideal voltmeter has infinite resistance to draw no current.
A Conservation of energy
B Conservation of mass
C Conservation of momentum
D Conservation of charge
Explanation: Sum of currents at a junction is zero, based on charge conservation.
A P = V2/R
B P = I2R
C P = VI
D All of these
Explanation: All three are equivalent expressions for power.
A High R in series
B Low R in series
C High R in parallel
D Low R in parallel
Explanation: Low resistance shunt in parallel bypasses excess current.
A Ampere
B Watt
C Volt
D Ohm
Explanation: EMF is measured in Volts.
A Plate thickness
B Current
C Applied voltage
D Plate area and separation
Explanation: C = epsilon0 A/d depends on area and separation.
A Stationary charges
B All particles
C Neutral particles
D Moving charges
Explanation: Magnetic force F = qv x B acts only on moving charges.
A Right hand thumb rule
B Left hand rule
C Coulomb\'s law
D Lenz\'s law
Explanation: Right hand thumb rule gives the field direction.
A Parallel to field
B Perpendicular to field
C At 45 degrees
D Current is zero
Explanation: F = BIL sin theta, maximum at 90 degrees.
A Tesla
B Weber
C Gauss
D Henry
Explanation: Magnetic flux is measured in Weber (Wb).
A Non-uniform
B Zero
C Uniform
D Random
Explanation: Inside a long solenoid, field is uniform and axial.
A 1 Wb/m
B 1 Wb/m2
C 1 Wb m
D 1 Wb m2
Explanation: 1 Tesla = 1 Weber per square meter.
A Max force
B Zero force
C Min force
D Variable force
Explanation: F = qvB sin 0 = 0 when parallel.
A Coil moves in uniform field
B Field strength changes
C Coil at rest in uniform field
D Field and coil stationary
Explanation: Flux changes when field, area, or angle changes.
A Applied voltage
B Rate of change of flux
C Current times resistance
D Magnetic field
Explanation: EMF = -dPhi/dt, the negative rate of flux change.
A Magnitude of EMF
B Direction of induced current
C Value of flux
D Speed of induction
Explanation: Lenz\'s Law states induced current opposes the change.
A Static electricity
B Electromagnetic induction
C Ohm\'s Law
D Coulomb\'s Law
Explanation: Transformers use mutual electromagnetic induction.
A No energy loss
B 50% loss
C 100% loss
D Variable efficiency
Explanation: Ideal transformer has 100% efficiency.
A Current
B Turns and geometry
C Voltage
D Temperature only
Explanation: L depends on number of turns, area, and length.