Moving Coil Galvanometer Concepts

The video tutorial explains the moving coil galvanometer, an electromagnetic device used to detect small electric currents. It covers the design, including the coil, iron core, and horseshoe magnet, and explains how the galvanometer is used in circuits. The tutorial also discusses the deflection of the needle, current sensitivity, and how to convert a galvanometer into an ammeter or voltmeter by adding resistors.

What is the primary function of a moving coil galvanometer?

• To store electrical energy

• To measure temperature

• To detect small electric currents

• To amplify sound

What is the role of the hair springs in a moving coil galvanometer?

• To generate magnetic fields

• To control the motion of the coil

• To store electrical charge

• To provide illumination

What is the purpose of the pointer in a moving coil galvanometer?

• To stabilize the coil

• To generate current

• To indicate the direction of current

• To show the deflection on the scale

What is the significance of the zero mark at the center of the galvanometer scale?

• It indicates maximum current

• It serves as a reference point for deflection

• It shows the battery voltage

• It marks the end of the scale

How does the pointer of a galvanometer behave when current flows through the circuit?

• It remains stationary

• It vibrates rapidly

• It deflects in a direction

• It emits light

What happens to the needle of a galvanometer when the direction of current flow changes?

• The needle stops moving

• The needle emits a sound

• The needle deflects in the opposite direction

• The needle vibrates

What is the relationship between the current in the galvanometer coil and the scale divisions?

• They are inversely proportional

• They are directly proportional

• They are unrelated

• They are logarithmically related

What is the term used for the resistor connected in parallel to convert a galvanometer into an ammeter?

• Shunt

• Load

• Capacitor

• Inductor

Why can't a galvanometer be used to measure large currents directly?

• It is not calibrated

• It has low resistance

• It has high resistance

• It is too sensitive

How is a galvanometer converted into a voltmeter?

• By connecting a high resistance in series

• By connecting a high resistance in parallel

• By connecting a low resistance in parallel

• By connecting a low resistance in series