PhysicsLAB: Practice with Induced Currents (Constant Area)

Worksheet
Practice with Induced Currents (Constant Area)

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Refer to the following information for the next three questions.

Which side of this permanent magnet is north: left or right?

leftright

As the falling magnet approaches the coil in which direction will the current induced in the coil flow: clockwise or counterclockwise?

clockwise from A to Bcounterclockwise from B to A

When the magnet exits the opposite side of the coil, which way will the induced current flow?

clockwise from A to Bcounterclockwise from B to A

Refer to the following information for the next three questions.

NOTE: the needle will deflect according to the direction of the induced current:

towards the left (clockwise current from B to A),
towards the right (counterclockwise current from A to B).

In which direction will the galvanometer's needle deflect as the magnet approaches?

towards the right since the current flows clockwise from A to B

towards the left since current flows counterclockwise from B to A

If the magnet were to be moved more rapidly towards the coil, what response would the galvanometer register?

the induced voltage and its subsequent current would decrease
the induced voltage and its subsequent current would remain unchanged
the induced voltage and its subsequent current would increase

When the magnet is withdrawn from the coil, back towards the left, in which direction will the galvanometer's needle be deflected?

towards the right since the current flows counterclockwise from A to B

towards the left since current flows clockwise from B to A

Refer to the following information for the next three questions.

Two coils of wire are wrapped on opposite ends of a common metal bar. The left coil is part of a circuit containing a switch and battery while the right coil only has a galvanometer to detect the presence of currents.

Which coil is considered the primary coil?

the left coilthe right coil

When the switch is closed, what happens in the induction coil?

Current momentarily flows clockwise through the galvanometer from B to A
A steady current will flow clockwise through the galvanometer from B to A
Current momentarily flows counterclockwise through the galvanometer from A to B
A steady current will flow counterclockwise through the galvanometer from A to B

If the induction coil were to be wrapped in the reverse direction, which of the above choices would then be correct?

Refer to the following information for the next two questions.

The left coil contains a variable resistor and a battery. A clockwise current is being induced in the right coil.

In which direction is the current flowing in the primary coil?

clockwisecounterclockwise

Should the magnitude of the resistance in the variable resistor be decreasing or increasing to induce a clockwise current in the induction coil?

decreasingincreasing