Questions
A source of constant voltage V is connected to a resistance R and two ideal inductors and through a switch S as shown. There is no mutual inductance between the two inductors. The switch S is initially open. At t=0, the switch is closed and current begins to flow. Which of the following options is/are correct?
detailed solution
Correct option is A
After a long time, t=∞, inductor behaves as conducting wire i=VR and L1i1=L2i2 and i=i1+i2⇒i1=L2L1+L2i=VRL2L1+L2 and i2=VRL1L1+L2 At t=0, inductor behaves like infinte resistance, so no current pass through resistor.Similar Questions
A long coaxial cable consists of two thin-walled conducting cylinders with inner radius 2 cm and outer radius 8 cm. The inner cylinder carries a steady current 0.1 A, and the outer cylinder provides the return path for that current. The current produces a magnetic field between the two cylinders. Find the energy stored in the magnetic field for length 5 m of the cable. Express answer in nano-J (use ln2 = 0.7).
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