Which of the followings represent the variation of frequency (f) with radius of cross section of a stretched string?

Which of the following figures represents the cross section of an OV ?

Which of the following figures represents the cross section of an OV ?

Which of the following curves represents the variation of impedence (Z) with frequency f in series LCR circuit?

Which of the following graphs represent the variation of current(I) with frequency (f) in an AC circuit containing a pure capacitor?

Which of the following represents the variation of inductive reactance (X_L) with the frequency of voltage source (upsilon) ?

Which of the following figure represent the cross section of an octahedral site?

Which one of the following curve represents variation of capacitive reactance with frequency?

Write down the frequency of the nth harmonic of a stretched string.