In the arrangement shown, reading of the ammeter just after the switch S is closed is 2 Amp and a long time after S is closed, the reading is 0.5 A. Then the value of R is

(2)Just after S is closed, no current flows through R and full current flows through the capacitor.∴    E50  =2      .....1A long time after S is closed, capacitor becomes fully charged, it does not allow any current to pass through it and full current flows through R.∴    E50+R  =0.5      .....21  ÷2⇒    50+R50  =20.5   ⇒  R=150Ω