NEET
Physics
Electro Magnetic Induction
NEET PYQ-Electro Magnetic Induction
question_answer
A coil of resistance \[400\,\Omega \] is placed in a magnetic field. If the magnetic flux \[\phi \] (Wb) linked with the coil varies with time t (sec) as \[\phi =50\,{{t}^{2}}+4\]. The current in the coil at \[t=2s\] is [AIPMT (S) 2012]
A) 0.5 A
B) 0.1 A
C) 2 A
D) 1 A
Correct Answer:
A
Solution :
Induced emf of coil \[E={{\left| -\frac{d\phi }{dt} \right|}_{t}}\]
Given, \[\phi =50{{t}^{2}}+4\] and \[R=400\,\Omega \]