MCQ
In a purely resistive $ac$ circuit, the current
- ALags behind the $e.m.f$. in phase
- ✓Is in phase with the $e.m.f.$
- CLeads the $e.m.f.$ in phase
- DLeads the $e.m.f$. in half the cycle and lags behind it in the other half
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Given : Earth's radius $=6.4 \times 10^6 m$.

