Quizlet
Ballistic Galvanometer
1. What is the name of the string by which the coil is suspended in a ballistic galvanometer?
- Aluminium strip
- Steel thread
- Copper wire
- Phosphor bronze strip
2. What is the ballistic constant in a ballistic galvanometer?
- A factor for adjusting the magnetic field strength
- A constant used to measure resistance
- A value used to calibrate the scale of the galvanometer
- A constant which, when multiplied by the first throw of the galvanometer, gives the amount of charge passed
3. What is a ballistic galvanometer used for?
- Detecting magnetic field direction
- Calculating voltage drops
- Measuring current in a circuit
- Estimating the quantity of charge flow through it
4. What is the purpose of the mirror in a ballistic galvanometer?
- To record the deflection of the coil using a lamp and scale arrangement
- To increase the magnetic flux
- To reflect heat from the coil
- To help balance the galvanometer
5. What is the use of a Morse key in the setup with a ballistic galvanometer?
- To switch the galvanometer on and off
- To charge a standard condenser and then discharge it through the galvanometer
- To measure resistance in the circuit
- To amplify the current signal
6. What is the function of the tapping (or damping) key in a ballistic galvanometer?
- To stop the motion of the coil
- To increase the deflection
- To reverse the current direction
- To calibrate the galvanometer
7. Why is a soft iron core placed within the coil of a ballistic galvanometer?
- To protect the coil from heat
- To act as a capacitor
- To reduce electrical resistance
- To increase the magnetic flux
8. What is the sensitivity of a ballistic galvanometer?
- It depends only on the magnetic field
- It is the same as voltage sensitivity
- It measures how fast the coil moves
- The charge sensitivity is 2/T times the current sensitivity and is the reciprocal of the ballistic constant
9. Why is a spring used in a ballistic galvanometer?
- To balance the galvanometer
- To increase current flow
- To provide restoring torque to the coil
- To reduce magnetic interference
10. What is a condenser and what is its use?
- It is a device that stores electric charge using two conductors with equal and opposite charges
- A device used to amplify electric signals
- A tool to convert electric energy into heat
- A resistor used for voltage control
11. What is logarithmic decrement in the context of a ballistic galvanometer?
- A measure accounting for the damping effect, which causes observed throw to be smaller than the true value
- A technique to measure time delay
- A factor to increase the sensitivity
- A method of calibrating a galvanometer