#JEE #NEET #IIT<br /><br />Question: A thin strip 10 cm long is on a U-shaped wire of negligible resistance and it is connected to a spring of spring constant 0.5 Nm-1 (see figure). The assembly is kept in a uniform magnetic field of 0.1 T. If the strip is pulled from its equilibrium position and released, the number of oscillations it performs before its amplitude decreases by a factor of e is N. If the mass of strip is 50 grams, its 10 Ω and air drag negligible, N will be close to: [JEE MAIN 8 April 2019] <br />(a) 1000 (b) 50000 (c) 5000 (d) 10000<br /><br /><br />Complete Physics for JEE and NEET @ Rs. 99 Only.<br /><a href="http://bit.ly/fullphysics" target="_blank" rel="nofollow">http://bit.ly/fullphysics</a><br /><br />Download our APP for better learning experience<br />Android APP Link:<br /><a href="https://play.google.com/store/apps/details?id=co.classplus.rac" target="_blank" rel="nofollow">https://play.google.com/store/apps/details?id=co.classplus.rac</a><br />IOS APP Link (use organization code : rac)<br /><a href="https://apps.apple.com/in/app/my-institute/id1472483563" target="_blank" rel="nofollow">https://apps.apple.com/in/app/my-institute/id1472483563</a><br />...<br /><a href="https://www.youtube.com/watch?v=JpWQo9krqMY" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=JpWQo9krqMY</a>