Table of Contents
- 1 How can we prevent galvanometer from being damaged?
- 2 What is the condition of galvanometer in a balanced bridge?
- 3 Can galvanometer be converted into ammeter?
- 4 Why is the coil of a ballistic galvanometer wound on a non metallic former?
- 5 How we can control the galvanometer sensitivity?
- 6 How could you increase the current sensitivity of a galvanometer by 50?
- 7 Why is the sensitivity of galvanometer higher than the deflection?
- 8 What happens to the galvanometer in a balanced Wheatstone bridge?
How can we prevent galvanometer from being damaged?
We can protect a galvanometer by using a shunt resistor. The resistance is usually connected in parallel to a galvanometer. This setup protects the galvanometer from strong or high amounts of currents. With the resistance, the value of current that flows through the circuit is controlled effectively.
What is the condition of galvanometer in a balanced bridge?
When Wheatstone bridge is in balance condition, the current through galvanometer will be. When the bridge is in balance condition, no current will flow through the galvanometer because potential difference between the two ends of galvanometer becomes same.
What is the deflection of galvanometer in a balanced condition?
Now if galvanometer and cell are interchanged, the galvanometer shows no deflection. Galvanometer will show no deflection. Proportionality of the arms are retained as the galvanometer and cell are interchanged.
How can we increase the deflection of galvanometer?
The deflection of the needle of galvanometer can be increased by:
- Increasing the number of the turns in the coil.
- Using a strong magnet.
- Increasing the speed with which magnet is moved in the coil.
Can galvanometer be converted into ammeter?
A galvanometer can detect only small currents. Thus, to measure large currents it is converted into an ammeter. It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer.
Why is the coil of a ballistic galvanometer wound on a non metallic former?
To minimise damping when high resistance is connected in series.
How do you balance a galvanometer?
Current will divide in magnitude to I1&I2 to go through resistors P and R. When no current flows through galvanometer current I1 will go through P and Q and current I2 will go through R and S. So, we can write. This is the required condition for a balanced galvanometer.
What is the deflection of a galvanometer in a balanced condition Mcq?
Wheatstone Bridge MCQ Question 1 Detailed Solution The bridge is said to be balanced when deflection in the galvanometer is zero i.e. no current flows through the galvanometer or in other words VB = VD.
How we can control the galvanometer sensitivity?
So, sensitivity of the galvanometer can be increased either by increasing the number of turns (N), using strong magnets or increasing the area of the coil (A). So, the correct answer is that the sensitivity of a moving coil galvanometer can be increased by increasing the number of turns of the coil.
How could you increase the current sensitivity of a galvanometer by 50?
To increase the current sensitivity of a moving coil galvanometer by 50\% its resistance is increased so that the new resistance becomes twice its initial resistance.
How a galvanometer can be used as an ammeter Explain with suitable diagram?
How do you use a galvanometer to measure voltage?
The galvanometer can be used to measure: a) the value of current in the circuit by connecting it in parallel to low resistance. b) the voltage by connecting it in series with high resistance. A galvanometer is converted into an ammeter by connecting it in parallel with a low resistance called shunt resistance.
Why is the sensitivity of galvanometer higher than the deflection?
The sensitivity of a galvanometer is higher if the instrument shows larger deflection for a small value of current. Sensitivity is of two types, namely current sensitivity and voltage sensitivity.
What happens to the galvanometer in a balanced Wheatstone bridge?
In a balanced Wheatstone Bridge, the galvanometer is replaced by another galvanometer of higher resistance. What happens to the balanced condition of the Bridge? 8 clever moves when you have $1,000 in the bank.
How do you find the shunt resistance of a galvanometer?
When current I G passes through the galvanometer, the current through the shunt resistance is given by I S = I – I G. The voltages across the galvanometer and shunt resistance are equal due to the parallel nature of their connection. Therefore R G.I G = (I- I G).R s The value of S can be obtained using the above equation.