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an electrostatic field
an electro-magnetic field
a magnetic field
an electric field
A cycle tyre bursts suddenly. This represents an
A cyclist moves due east at 8 km/h for half an hour and then turns exactly southwards for another half an hour at 6 km/h. The average velocity of the cyclist for the period is
A decibel is
A device G.M counter is used for the measurement of which of the following?
A device used for converting a.c. into d.c. is called
A device which is used to limit the current in an electrical circuit is called a
A diagnostic technique commonly known as Ultrasound is based on recording
A double convex glass lens of focal length f and having a circular aperture is cut into two halves, each having a semicircular aperture. The focal length of each half is
A drop of liquid assumes spherical shape because
A dynamo is a device which