Embibe Experts Solutions for Exercise 4: Assignment

In a carbon resistor the colour code is as following

Red Orange Yellow Golden

the resistance of resistor is

Consider the following circuit, the device in the box is not known. When the key is closed, the galvanometer initially gives some deflection but finally it decays to zero

In an experiment of determination of focal length of a lens with the help of optical bench, a student obtained the following curve for convex lens.

The figure of merit of a galvanometer is $2\mathrm{x}{10}^{-4} \mathrm{A}/\mathrm{division}$. Total number of division in galvanometer are $20$. What resistance is required to convert it in voltmeter of range $10 \mathrm{volts}$. (Resistance of the galvanometer is $100 \mathrm{\Omega }$)

A voltmeter has a least count of $0.1 \mathrm{V}$and an ammeter has a least count of $0.1 \mathrm{A}$. The potential drop $V$ across a resistance is measured as $10.0 \mathrm{V}$ and current through it is measured as $1.0 \mathrm{A}$. Select the correct alternative.

In a screw gauge, there are $100$ divisions in circular scale and each main scale division is of $1 \mathrm{mm}$. With no gap between the jaws, ${98}^{\mathrm{th}}$ divisions coincides with the main scale and zero of main scale is not visible. While measuring the diameter of a ball, the circular scale is between $3 \mathrm{mm}$ mark and $4 \mathrm{mm}$ mark. ${76}^{\mathrm{th}}$ division of circular scale coincides with the reference line. Select the correct alternative

In an experiment to measure the focal length $\left(f\right)$ of a concave mirror, the object distance$\left(x\right)$ and image distance$\left(y\right)$ measured as $(24.0\pm 0.1) \mathrm{cm}$ and $(12.0\pm 0.1) \mathrm{cm}$ respectively, then $\left(\frac{1}{x}+\frac{1}{y}=\frac{1}{f}\right)$

Identify the incorrect set up to verify Ohm's law