This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer- c
Explanation- The device which follows square law is used for modulation purpose. Characteristics shown by (i) and (iii) corresponds to linear devices.
Characteristics shown by (ii) corresponds to square law device. Some part of (i) also
Follow square law.
Hence, (ii)and (iv) can be used for modulation.
<p>This is a Multiple Choice Questions as classified in NCERT Exemplar</p><p>Answer- c</p><p><strong>Explanation- </strong>The device which follows square law is used for modulation purpose. Characteristics shown by (i) and (iii) corresponds to linear devices.</p><p>Characteristics shown by (ii) corresponds to square law device. Some part of (i) also</p><p>Follow square law.</p><p>Hence, (ii)and (iv) can be used for modulation.</p>
µ = A? /A? = 0.5 {A? = 20 volt, A? = 40 volt} m (t) = A? sin ω? t {ω? = 2π×10? } c (t) = A? sin ω? t {ω? = 2π×10×10³} C? (t) = (A? + A? sin ω? t) sin ω? t ⇒ A? {1+ µsin ω? t} sin ω? t
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