MCQ
A magnetic field can be produced by
- AA moving charge
- BA changing electric field
- CNone of these
- ✓Both of these
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$(A)$ If $\vec{B}$ is along $\hat{z}, F \propto(L+R)$
$(B)$ If $\overrightarrow{ B }$ is along $\hat{ x }, F =0$
$(C)$ If $\vec{B}$ is along $\hat{y}, F \propto(L+R)$
$(D)$ If $\overrightarrow{ B }$ is along $\hat{ z }, F =0$
Reason : An ideal voltmeter draws almost no current due to very large resistance, and hence $(V)$ and $(a)$ will read zero.
(where ${m_\alpha } = 4.00260\,u$, $m\left( {{}_{88}^{226}Ra} \right)=226.02540\,u$ and $m\left( {{}_{86}^{222}Rn} \right)=222.01750\,u)$