MCQ
It is possible to hear beats from the two vibrating sources of frequency
- A$100 Hz$ and $150 Hz$
- ✓$20 Hz$ and $25 Hz$
- C$400 Hz$ and $500 Hz$
- D$1000 Hz$ and $1500 Hz$
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$1.$ The magnitude of the induced electric field in the orbit at any instant of time during the time interval of the magnetic field change is :
$(A)$ $\frac{B R}{4}$ $(B)$ $\frac{B R}{2}$ $(C)$ $BR$ $(D)$ $2BR$
$2.$ The change in the magnetic dipole moment associated with the orbit, at the end of the time interval of the magnetic field change, is:
$(A)$ $-\gamma B Q R^2$ $(B)$ $-\gamma \frac{B Q R^2}{2}$ $(C)$ $\gamma \frac{ BQR ^2}{2}$ $(D)$ $\gamma B Q R^2$
Give the answer question $1$ and $2.$
