MCQ
A solenoid is at potential difference 60 V and current flows through it is 15 ampere, then the resistance of coil will be
- ✓4 Ω
- B8 Ω
- C0.25 Ω
- D2 Ω
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$\rho(r)=\left\{\begin{array}{ll}\rho_{0}\left(\frac{3}{4}-\frac{r}{R}\right) & \text { for } r \leq R \\ \text { Zero } & \text { for } r>R\end{array}\right.$
Where, $r ( r < R )$ is the distance from the centre $O$ (as shown in figure). The electric field at point $P$ will be.


