For treating arthritis

radio waves are used

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direct current is used

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mircowaves are used

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AC of high frequency is used

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Solution

The correct option is D AC of high frequency is used
AC sources with high frequencies( $10^{6} H z$ ) are used for treatment of arthritis.
Waves with same frequencies can also be used.
Wavelength of such waves $\approx 3 k m$ .Thus radio waves have such a frequency.

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