Question

A coil of resistance 400 is placed in magnetic field. If the magnetic flux Φ (Wb) linked with the coil varies with time t (sec) as Φ = 50t² +4.
The current in the coil at t= 2 s is

0.5 A

0.1 A

2 A

1 A

Solution

0.5 A

$Induced space emf space of space space coil space straight E space equals space open vertical bar negative dΦ over dt close vertical bar subscript straight t Given comma space equals space 50 straight t squared space plus 4 space and space straight R space equals space 400 straight capital omega straight E equals space open vertical bar negative dΦ over dt close vertical bar subscript straight t space equals 2 end subscript space equals open vertical bar 100 straight t close vertical bar subscript straight t equals 2 end subscript space equals space 200 straight V Current space space in space the space coil space straight i space equals space straight E over straight R space equals space 200 over 400 space equals space 0.5 space straight A space$

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Electric Charges And Fields

A coil of resistance 400 is placed in magnetic field. If the magnetic flux Φ (Wb) linked with the coil varies with time t (sec) as Φ = 50t² +4.
The current in the coil at t= 2 s is

0.5 A

0.1 A

2 A

1 A

Some More Questions From Electric Charges and Fields Chapter

a) An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
b) Explain why two field lines never cross each other at any point?

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For Daily Free Study Material Join wiredfaculty

Electric Charges And Fields

A coil of resistance 400 is placed in magnetic field. If the magnetic flux Φ (Wb) linked with the coil varies with time t (sec) as Φ = 50t2 +4.The current in the coil at t= 2 s is 0.5 A 0.1 A 2 A 1 A

Some More Questions From Electric Charges and Fields Chapter

a) An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?b) Explain why two field lines never cross each other at any point?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

A coil of resistance 400 is placed in magnetic field. If the magnetic flux Φ (Wb) linked with the coil varies with time t (sec) as Φ = 50t² +4.
The current in the coil at t= 2 s is

0.5 A

0.1 A

2 A

1 A

a) An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
b) Explain why two field lines never cross each other at any point?