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Chapter 14: Problem 29

Which of the following has the maximum resistance? (A) Voltmeter (B) Millivoltmeter (C) Ammeter (D) Milliammeter

Short Answer

Expert verified
The instrument with the maximum resistance is the \(Voltmeter\). Therefore, the answer is \((A)\) Voltmeter.

Step by step solution

01

Understanding the Instruments and their Resistances

Each of these instruments has a certain resistance associated with it based on its design and the role it plays in a circuit. The resistance is high for a device connected in parallel (like a Voltmeter or Millivoltmeter) and low for an instrument installed in series (like an Ammeter or Milliammeter). High resistance in a parallel-connected device ensures it doesn't draw much current, which could interfere with the operation of the rest of the circuit. Series-connected devices have low resistance, again to avoid disturbing the circuit, but this time by not presenting a significant resistance to the current flow.
02

Comparing the Resistances

Between Voltmeter and Millivoltmeter, the one connected across the larger potential difference, Voltmeter, will have more resistance. This is to ensure that the device itself doesn't draw too much current while trying to measure the voltage. Between Ammeter and Milliammeter, both are used to measure current and are connected in series, and because of this, they would ideally have near-zero resistance. But in practical reality, Ammeter will have a small resistance associated, but it would be less than Milliammeter which is used for smaller current measurements.
03

Identifying Maximum Resistance

Given that the resistance rankings based on their connections and roles in the circuit, from high to low, are: Voltmeter, Millivoltmeter, Milliammeter and Ammeter. The instrument with the maximum resistance is the Voltmeter. So the answer to the exercise is (A) Voltmeter.

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Most popular questions from this chapter

Two cells with the same EMF \(E\) and different internal resistances \(r_{1}\) and \(r_{2}\) are connected in series to an external resistance \(R\). The value of \(R\) for the potential difference across the first cell to be zero is (A) \(\sqrt{r_{1} r_{2}}\) (B) \(r_{1}+r_{2}\) (C) \(r_{1}-r_{2}\) (D) \(\frac{r_{1}+r_{2}}{2}\)

A cell of emf \(E\) is connected across a resistance \(R\). The potential difference between the terminals of the cell is found to be \(V\). The internal resistance of the cell must be (A) \(\frac{2(E-V) V}{R}\) (B) \(\frac{2(E-V) R}{E}\) (C) \(\frac{(E-V) R}{V}\) (D) \((E-V) R\)

A potentiometer is a device used for measuring EMF and internal resistance of a cell. It consists of two circuits, one is main circuit in which there is a cell of given emf \(\varepsilon^{\prime}\) and given resistance \(R\) which is connected across a wire of length \(100 \mathrm{~cm}\) and having resistance \(r\) and another circuit having unknown EMF \(\varepsilon\) and galvanometer. For a given potentiometer, if \(\varepsilon^{\prime}=30 \mathrm{~V}, r=1 \Omega\), and resistance \(R\) varies with time \(t\) given by \(R=2 t\). The jockey can move on wire with constant velocity \(10 \mathrm{~cm} / \mathrm{s}\) and switch \(S\) is closed at \(t=0\)If jockey starts moving from \(A\) at \(t=0\) and balancing point found at \(t=1 \mathrm{~s}\) then the value of \(\varepsilon\) is (A) \(1 \mathrm{~V}\) (B) \(2 \mathrm{~V}\) (C) \(3 \mathrm{C}\) (D) \(4 \mathrm{~V}\)

A galvanometer having a coil resistance of \(100 \Omega\) gives a full scale deflection, when a current of \(1 \mathrm{~mA}\) is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of \(10 \mathrm{~A}\), is (A) \(2 \Omega\) (B) \(0.1 \Omega\) (C) \(3 \Omega\) (D) \(0.01 \Omega\)

Assertion: Three identical very large metallic plates having charges \(Q,-Q\), and \(3 Q\), respectively are placed parallel. If middle is earthed through a switch, then charge flow through the switch is \(-Q\). Reason: In above assertion, final charge on middle plate is \(-4 Q\). (A) A (B) \(\mathrm{B}\) (C) \(\mathrm{C}\) (D) D
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