It is 2.
The maximum number of parabola that we can draw at the same time from the given extremities of Latus rectum is 2.
Answer is B.
As the length of the wire is changed, it's cross sectional area will also change but volume remains same.
Radius decreases by factor of 2^(1/2).
Resistance=(rho L)/A
Using above relation , new resistance will be 4R
If the oscillation is simple harmonic motion then we have,
Inserting given data, we get the spring constant approximately equal to 79N/m.
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