Electromagnetic Induction & AC · JEE Main previous year questions

2005 2 questions

1. Q1232005 · 28 Apr 2005 · Shift 1

   Two concentric coils each of radius equal to $2\pi \mathrm{cm}$ are placed at right angles to each other. $3$ ampere and $4$ ampere are the currents flowing in each coil respectively . The magnetic induction in $Weber/{\mathrm{m}}^2$ at the center of the coils will be $(\mu =4\pi \times 10^{-7}Wb/A.m)$

   1. A.$10^{-5}$
   2. B.$12\times 10^{-5}$
   3. C.$7\times 10^{-5}$
   4. D.$5\times 10^{-5}$
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   Answer: D

2. Q1282005 · 28 Apr 2005 · Shift 1

   The phase difference between the alternating current and $emf$ is $\frac{\pi }{2}$. Which of the following cannot be the constituent of the circuit?

   1. A.$R,L$
   2. B.$C\text{ alone}$
   3. C.$L\text{ alone}$
   4. D.$L,C$
   Show answer

   Answer: A