JEE Main 2023 (Online) 1st February Morning Shift | Current Electricity Question 75 | Physics

The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50 \%$. The percentage change in voltage sensitivity of the galvanometer will be :

$0 \%$

$75 \%$

$100 \%$

$50 \%$

JEE Main 2023 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

-1

The $\mathrm{H}$ amount of thermal energy is developed by a resistor in $10 \mathrm{~s}$ when a current of $4 \mathrm{~A}$ is passed through it. If the current is increased to $16 \mathrm{~A}$, the thermal energy developed by the resistor in $10 \mathrm{~s}$ will be :

$\frac{\mathrm{H}}{4}$

$16 \mathrm{H}$

$4 \mathrm{H}$

JEE Main 2023 (Online) 31st January Morning Shift

MCQ (Single Correct Answer)

-1

The drift velocity of electrons for a conductor connected in an electrical circuit is $$\mathrm{V}_{\mathrm{d}}$$. The conductor in now replaced by another conductor with same material and same length but double the area of cross section. The applied voltage remains same. The new drift velocity of electrons will be

$$\frac{V_{d}}{4}$$

$$\mathrm{V}_{\mathrm{d}}$$

$$2 \mathrm{~V}_{\mathrm{d}}$$

$$\frac{V_{d}}{2}$$

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