Two coils 'P' and ' Q ' are separated by some distance.

Question:

Two coils 'P' and ' $Q$ ' are separated by some distance. When a current of $3 A$ flows through coil ' $P$ ', a magnetic flux of $10^{-3} \mathrm{~Wb}$ passes through ' $\mathrm{Q}$ '. No current is passed through ' $Q$ '. When no current passes through ' $P$ ' and a current of 2 A passes through ' $Q$ ', the flux through ' $P$ ' is:

  1. (1) $6.67 \times 10^{-4} \mathrm{~Wb}$

  2. (2) $3.67 \times 10^{-3} \mathrm{~Wb}$

  3. (3) $6.67 \times 10^{-3} \mathrm{~Wb}$

  4. (4) $3.67 \times 10^{-4} \mathrm{~Wb}$


Correct Option: 1

Solution:

(1) $Q_{\text {coil }}=(N Q) \propto i$

So, $\frac{Q_{1}}{Q_{2}}=\frac{i_{1}}{i_{2}}=\frac{3}{2}$

or $Q_{2}=\frac{2}{3} Q_{1}=\frac{2}{3} \times 10^{-3}=6.67 \times 10^{-4} \mathrm{~Wb}$

Leave a comment

Close
faculty

Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now