MEDIUM
12th ICSE
IMPORTANT
Earn 100
Can we increase or decrease the range of a given voltmeter?
Important Questions on Torque on a Current-Loop : Moving-Coil Galvanometer
MEDIUM
12th ICSE
IMPORTANT
Out of the two identical galvanometers, one is to be converted into an ammeter and the other into a milliammeter. Which of the shunts will be of larger resistance?
MEDIUM
12th ICSE
IMPORTANT
Which of the resistances of a voltmeter and a millivoltmeter is smaller?
MEDIUM
12th ICSE
IMPORTANT
A current-carrying wire of high resistance has an ammeter in series and a voltmeter in parallel. After some time the wire becomes hot but the ammeter and the voltmeter do not. Give reason.
HARD
12th ICSE
IMPORTANT
A moving-coil galvanometer consists of a rectangular coil of N turns, each of area A, suspended in a radial magnetic field of flux density B. Derive the expression for the torque on the coil when current I passes through it. Draw suitable labelled diagram.
HARD
12th ICSE
IMPORTANT
Obtain the formula for a moving-coil galvano-meter. Given : the deflecting torque where m is the magnetic dipole moment of the coil placed in the magnetic field B, I is the current in the galvanometer and is the deflection.
HARD
12th ICSE
IMPORTANT
Explain the principle and construction of a moving-coil galvanometer. Prove that in a radial field the current in the coil is directly proportional to the deflection of the coil.
HARD
12th ICSE
IMPORTANT
Describe the Working of a moving-coil galvanometer. How can its sensitivity be increased?
HARD
12th ICSE
IMPORTANT
Why is it that a shunt is required to be connected in parallel with a moving-coil galvanometer to measure the current of a circuit?
Establish the equation
