1. What does it mean when the needle of the galvanometer is deflected? 2. Why is

Question

1. What does it mean when the needle of the galvanometer is deflected?

2. Why is there a deflection in step a.

3. Why is there no deflection on step b.

4, Why are the deflections opposite in step a and c?

5. Whay difference does the iron core make? Why?

Part 3: Put two induction coils next to each other with their centers aligned. The "primary" coil is the one that will be briefly connected to the power supply, set on a low setting. The "secondary" coil is the one connecte galvanometer. Initially, connect the circuit with the power turning on the power supply. Observe the deflection in the galvano coil on and off. ich other with their centers aligned. The "primary" coil is the one that will be er supply, set on a low setting. The "secondary" coil is the one connected to the OFF. Now, produce a current in the primary by meter as you turn current to the primary Initially, connect the eircuit with the power OFF. Now, produce a current in the primary Step primarysecondary Turn current Leave Turn current current on coil coil on Galvanometer deflection t- or 0) connect to power supply conmect to galvanome

Explanation / Answer

1) when current flows through the galvanometer the nedle is deflected.

2) when a sudden current flows through the primary coil, magnetic flux through the secondary coil changes.

so, induced current flows through the secondary coil.

3) when a constant current flows through the primary loop, magnetic flux through the seconadry coil is also constant.

when there is no change in magnetic flux through the seconadry coil, there is no induced current in the seconadry coil.

4) when current is turned off, suddenly the magnetic flux through the seconadry loop decreases.

so, induced current flows through the secondary loop.

This induced current opposite to the current in step a

5) It increases magnetic flux through the secondary coil.

because its permeability is very large.

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