A small coil `C` with N = 200 turns  is mounted  on one  end of a balance  beam and introduced betwe
Channel: Doubtnut
Date: 2020-08-16

A small coil `C` with N = 200 turns  is mounted  on one  end of a balance  beam and introduced between  the poles of an electromagnet  as shown in Fig. The cross  sectinal area of the  coil  is `S = 1.0 cm^(2)`, the length of the  arm `OA` of the balance beam is  `l = 30 cm`. When there is no current  in the coil  the balance is irl equilibrium. On passing  a current  `I = 22 mA` through  the coil the  equiibrium  is restroed  by putting  the additional counterweight of  mass `Delta m = 60 mg` ont he balnace pan. Find the magnetic  induction  at the spot  where the coil is located. img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/IROD_V01_C03_E01_254_Q01.png" width="80%"