An infinite number of charges, each equal to 4C, are placed along the x-axis at x = 1 m, x = 2 m, x = 4 m, x = 8 m and so on. The total force on a charge of 1C placed at the origin is

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Two waves y1=Acos(0.5πx−100πt) and y2=Acos(0.46πx−92πt) are travelling in a pipe placed along x-axis. Find the number of times intensity is maximum in time interval of 1 sec.

The correct option is A 4Beat frequency=|f1−f2|=(50−46)=4s−1One beat frequency consists of a maximum and a minimumSo the number of maxima are f=4

Two waves $y_{1} = A cos (0.5 π x - 100 π t)$ and $y_{2} = A cos (0.46 π x - 92 π t)$ are travelling in a pipe placed along $x$ -axis. Find the number of times intensity is maximum in time interval of 1 sec.

The correct option is A $4$
Beat frequency $= | f_{1} - f_{2} | = (50 - 46) = 4 s^{- 1}$
One beat frequency consists of a maximum and a minimum
So the number of maxima are $f = 4$