NEET Physics Waves Questions Solved

Watch Physics > Waves Videos
play button

A metal wire of linear mass density of 9.8 g/m is stretched with a tension of 10 kg weight between two rigid supports 1 metre apart. The wire passes at its middle point between the poles of a permanent magnet, and it vibrates in resonance when carrying an alternating current of frequency n. The frequency n of the alternating source is 

(1) 25 Hz

(2) 50 Hz

(3) 100 Hz

(4) 200 Hz

(2) In condition of resonance, frequency of a.c. will be equal to natural frequency of wire

n=12lTm=12×110×9.89.8×103=1002=50 Hz

Difficulty Level:

  • 10%
  • 54%
  • 37%
  • 0%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 22, 2019)