WorksheetsCh4- Moving Charges and Magnetism :Moving Coil Galvanometer
Total questions: 10
Worksheet time: 5mins
In moving coil galvanometer, the pole faces of U-shaped magnet are made concave
to make the field radial
to increase the field
to weaken the field
both (a) and (b)
In a moving coil galvanometer, the deflection of the coil Φ is related to the electric current i by the relation
I ∝ tanΦ
I ∝ Φ
I ∝ Φ2
I ∝ tan2Φ
The sensitivity of a moving coil galvanometer can be increased by decreasing
the number of turns in the coil
the area of the coil
the magnetic field
the restoring torque per unit twist of the suspension
A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is
NA2B2I
NABI2
N2ABI
NABI
Formula for figure of merit of galvanometer
(R−G)θk
(R+G)θk
What is meant by the figure of merit of a galvanometer?
Maximum deflection on the galvanometer
Current required to produce unit deflection on the galvanometer
Voltage required to produce unit deflection on the galvanometer
What is the principle of Moving Coil Galvanometer.
Current carrying coil in an electric field experiences a force
Current carrying coil in magnetic field experiences no force
Current carrying conductor in magnetic field experiences a force
Current carrying conductor in an electric field produces no force
The ratio of voltage sensitivity ( Vs ) and current sensitivity ( Is ) of a moving coil galvanometer is (G =conductance)
G1
G21
G
G2
Which rule can be used to work out which way a coil of wire rotates in a motor?
Fleming's left-hand rule
Fleming's right-hand rule
The direction of the force on a current-carrying wire placed in a magnetic field depends on
the direction of the current
the direction of the field
the direction of current as well as field
neither the direction of current nor the direction of field
