Permanent magnetismHard
Question
Alternating current can not be measured by D.C. ammeter because
Options
A.A.C. cannot pass through D.C.
B.A.C. changes direction
C.average value of current for complete cycle is zero
D.D.C. ammeter will get damaged.
Solution
DC ammeters are designed on basis moving coil galvanometer which calibrated with average Passed current but in AC current average is ZERO
Create a free account to view solution
View Solution FreeMore Permanent magnetism Questions
A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°. The torque needed ...The length of a magnet is large compared to its width and breadth.The time period of its oscillation in a vibration magn...A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a tim...A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It:...What should be amount of current through the ring of radius of 5 cm so that field at the centre equal to the eatrh′...