MHT CET20249 May 2024Evening ShiftPhysicsMagnetic Effects of CurrentActual
A long solenoid carrying a current produces magnetic field B along its axis. If the number of turns per cm are tripled and the current is made ( 1 4 )^ th then the new value of magnetic field will be
Options
- AB 3
- BB 4
- C3 B 4
- D2 ~B 3
Correct answer
C. 3 B 4
Step-by-step solution
Magnetic field due to a solenoid is given by, B= ₀ NIL After reducing current and increasing number of turns, B ^ = ₀(3 ~N ) ( I 4 ) L = 3 4 ( ₀ NIL )= 3 4 ~B