Inductance

Lenz’s Law of electromagnetic induction is about the conservation of

• Energy.

• Mass.

• Charges.

• Momentum

An e.m.f will be induced in a straight conductor if

• the conductor is stationary across a constant magnetic flux.

• a constant magnetic flux is placed parallel to the conductor.

• the conductor cuts across a constant magnetic flux.

• the conductor moves parallel to a constant magnetic flux.

According to the Lenz’s Law,

• the induced e.m.f is proportional to the magnetic field.

• the direction of the induced e.m.f is such that it will oppose the change causing it.

• Fleming’s Left hand rule can be used to determine the direction of induced e.m.f.

• the induced e.m.f is always in opposite direction to the magnetic field.

The magnetic field produced by a long straight current-carrying wire is

• proportional to both the current in the wire and the distance from the wire.

• proportional to the current in the wire and inversely proportional to the distance from the wire.

• inversely proportional to the current in the wire and proportional to the distance from the wire.

• inversely proportional to both the current in the wire and the distance from the wire.

Determine the factors which will not increases the induce emf of a coil

• increasing the magnetic field.

• increasing the cross sectional area of the coil

• increasing the number of turns of the coil

• decreasing the strength of magnetic field

Which of the following is not the unit for magnetic field strength?

• Tesla

• Weber per meter squared

• Weber per second squared

• Gauss

Number of magnetic field line passes through an area is the definition for

• magnetic flux

• current carrying conductors

• induced emf

• magnetic field

Rate of change in magnetic flux is

• proportional to induced emf

• inversely proportional to induced current

• equal to magnetic flux

• directly proportional to wire

The voltage induced across an inductor as its magnetic field collapses is called ____.

• Counter emf
• Transition voltage
• Reverse voltage
• Counter voltage

In order to induce a voltage across a coil ____.

• The coil must be in motion
• Current must be increasing
• There must be relative motion between the coil and the magnetic field
• The coil must be cut by at least 10^8 lines of force per second

Tags

NGSS.HS-PS2-5