WorksheetsEDDY CURRENTS
Total questions: 15
Worksheet time: 8mins
EDDY CURRENTS ARE PRODUCED IN A MATERIAL WHEN IT IS
HEATED
PLACED IN ELECTRIC FIELD
PLACED IN UNIFORM CONSTANT MAGNETIC FIELD
PLACED IN TIME VARYING MAGNETIC FIELD
EDDY CURRENTS ARE USED IN
INDUCTION FURNACE
ELECTROMAGNETIC BRAKES
SPEEDOMETERS
ALL OF THESE
ASSERTION : IRON LOSS IS MINIMIZED USING LAMINATED CORE
REASON: LAMINATION OF CORE REDUCES EDDY CURRENTS
BOTH ASSERTION AND REASON ARE TRUE AND REASON IS THE CORRECT EXPLANATION OF THE ASSERTION
BOTH ASSERTION AND REASON ARE TRUE AND REASON IS NOT THE CORRECT EXPLANATION OF THE ASSERTION
ASSERTION IS TRUE BUT REASON IS FALSE
ASSERTION AND REASON IS FALSE
CURRENT IN A CIRCUIT FALLS FROM 5A TO 0A IN 0.1S. IF AN AVERAGE EMF 200V IS INDUCED,SELF INDUCTANCE OF THE CIRCUIT IS
1H
2H
3H
4H
SLOTTING PROCESS IN THE METALLIC SHEET CAUSES
INCREASE IN RESISTANCE OF THE PATH FOR CIRCULATION OF CURRENT
DECREASE IN STRENGTH OF EDDY CURRENT
FEEBLE THE ELECTROMAGNETIC DAMPING
ALL OF THESE
IF N IS THE TOTAL NUMBER OF TURNS IN A COIL,THEN THE VALUE OF SELF INDUCTANCE VARIES AS
N^0
N
N^2
N^1/2
WORK DONE IN INCREASING THE CURRENT THROUGH A SOLENOID FROM 0 TO 2A IS 20J .WORK DONE IN INCREASING CURRENT FROM 4 TO 6A IS
60J
100J
80J
120J
WHICH OF THE FOLLOWING IS NOT BASED ON THE APPLICATION OF EDDY CURRENTS
TANGENT GALVANOMETER
SPEEDOMETER
DEAD BEAT GALVANOMETER
ENERGY METER
INDUCTION FURNACE CAN BE USED TO
MIX DIFFERENT METALS
UTILISED TO PREPARE ALLOYS
TO COOK FOOD
Inductance depends only on
the geometry of the coil
intrinsic material properties
current flowing through the inductor
both a and b
Inductance is a
vector quantity
scalar quantity
SI unit of inductance is
ohm
farad
henry
The mutual inductance of a pair of
coils, solenoids, etc., depends on
their separation
relative
orientation
their separation as well as relative
orientation
If we fill the inside of the solenoid with a material of relative permeability
μr (for example soft iron, which has a high value of relative permiability),
then,
L=μ0μrN2Al
L=μ0n2Al/μr
L=μ0μrn2Al
L=μ0μrAl/n2
Consider the case of currents flowing simultaneously in two nearby coils.the emf induced in coil 1 is given by
both a and b
all the above
