1. A circuit contains an ammeter, a battery of 30V and a resistance 40.8Ω all connected in series. If the ammeter has a coil of resistance 480Ω and a shunt of 20Ω, the reading in the ammeter will be:

1. 1. 0.25 A ​

   
   
   

   2. ​2A ​

   
   
   

   3. 1 A ​

   
   
   

   4. ​0.5 A

   
   
   

---

1. View Hint View Answer Discuss in Forum

   ​From circuit diagram ​​​ ​
   
   

   Resistance of ammeter =	480 × 20	= 19.2Ω.
   	480 + 20

   
   ​Total resistance R = 40.8 + 19.2 = 60Ω ​
   Reading in the ammeter i = V/R
   

   =	30	= 0.5 A
   	40.8 + 19.2

   Correct Option: D

   ​From circuit diagram ​​​ ​
   
   

   Resistance of ammeter =	480 × 20	= 19.2Ω.
   	480 + 20

   
   ​Total resistance R = 40.8 + 19.2 = 60Ω ​
   Reading in the ammeter i = V/R
   

   =	30	= 0.5 A
   	40.8 + 19.2

---

2. A particle of mass m, charge Q and kinetic energy T enters a transverse uniform magnetic field of induction ^→_B . After 3 seconds, the kinetic energy of the particle will be :

1. 1. 3T

   
   
   

   2. 2T

   
   
   

   3. T

   
   
   

   4. 4T

   
   
   

---

1. View Hint View Answer Discuss in Forum

   When a charged particle enters a transverse magnetic field it traverse a circular path. Its kinetic energy remains constant.

   Correct Option: C

   When a charged particle enters a transverse magnetic field it traverse a circular path. Its kinetic energy remains constant.

---

---