- Yes there is a deflection. 2) The voltmeter will measure the time rate of change of the magnetic flux enclosed by the conductor + voltmeter circuit (Faraday's law).
Elaboration: Faraday's law says that the line integral of the electric field around a loop (loop emf), is equal to the time rate of change of the magnetic flux enclosed by the loop \begin{equation} \oint \mathbf{E \cdot ds}=-\frac{d\Phi}{dt} \end{equation}\begin{equation} emf = -\oint \mathbf{E \cdot ds}=\frac{d\Phi}{dt} \end{equation}
For this particular loop, consisting of a conductor + a voltmeter:
- the contribution to the line integral from the part of the loop within the conductor is 0, by definition of a conductor. (The charges within the conductor distribute themselves so as to null its electric field.)
- therefore the remainder of the line integral (the voltmeter portion of the circuit) must be the full loop emf:
\begin{equation} \oint \mathbf{E \cdot ds} = \int_{cond} \mathbf{E \cdot ds} + \int_{v-mtr} \mathbf{E \cdot ds} = 0 +\int_{v-mtr} \mathbf{E \cdot ds}=-\frac{d\Phi}{dt} \end{equation}\begin{equation} -\oint \mathbf{E \cdot ds} = -\int_{cond} \mathbf{E \cdot ds} - \int_{v-mtr} \mathbf{E \cdot ds} = 0 -\int_{v-mtr} \mathbf{E \cdot ds}=\frac{d\Phi}{dt} \end{equation}