direction test

There is no direct test for the detection of which element in an organic compound?

There is no direct test for the detection 0? following in organic compound

Amongst the following elements present in an organic compound, the element which does not have a direct test is

A negative test charge is moving near a long straight wire carrying a current. The force acting on the test charge is parallel to the direction of the current. The motion of the charge is:

Fig. shows three electric field lines. (a) What is the direction of the electrostatic force on a positive test charge placed at points A and B ? (b) At which point A or B, will the acceleration of the test charge be greater if the charge is released? .

There is an initial test before actual construction of a test. The initial test is called