JEE Main 2016 (Online) 9th April Morning Slot | Current Electricity Question 284 | Physics

A 50 $$\Omega $$ resistance is connected to a battery of 5 V. A galvanometer of resistance 100 $$\Omega $$ is to be used as an ammeter to measure current through the resistance, for this a resistance r_s is connected to the galvanometer. Which of the following connections should be employed if the measured current is within 1% of thecurrent without the ammeter in the circuit ?

r_s = 0.5 $$\Omega $$ in parallel with the galvanometer

r_s = 0.5 $$\Omega $$ in series with the galvanometer

r_s = 1 $$\Omega $$ in series with galvanometer

r_s =1 $$\Omega $$ in parallel with galvanometer

JEE Main 2016 (Offline)

MCQ (Single Correct Answer)

-1

A galvanometer having a coil resistance of $$100\,\Omega $$ gives a full scale deflection, when a currect of $$1$$ $$mA$$ 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 $$10$$ $$A,$$ is :

$$0.1\,\Omega $$

$$3\,\Omega $$

$$0.01\,\Omega $$

$$2\,\Omega $$

JEE Main 2015 (Offline)

MCQ (Single Correct Answer)

-1

JEE Main 2015 (Offline) Physics - Current Electricity Question 286 English

In the circuit shown, the current in the $$1\Omega $$ resistor is :

$$0.13$$ $$A,$$ from $$Q$$ to $$P$$

$$0.13$$ $$A$$, from $$P$$ to $$Q$$

$$1.3A$$ from $$P$$ to $$Q$$

$$0A$$

JEE Main 2015 (Offline)

MCQ (Single Correct Answer)

-1

When $$5V$$ potential difference is applied across a wire of length $$0.1$$ $$m,$$ the drift speed of electrons is $$2.5 \times {10^{ - 4}}\,\,m{s^{ - 1}}.$$ If the electron density in the wire is $$8 \times {10^{28}}\,\,{m^{ - 3}},$$ the resistivity of the material is close to :

$$1.6 \times {10^{ - 6}}\Omega m$$

$$1.6 \times {10^{ - 5}}\Omega m$$

$$1.6 \times {10^{ - 8}}\Omega m$$

$$1.6 \times {10^{ - 7}}\Omega m$$

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