JEE Main 2019 (Online) 10th January Evening Slot | Current Electricity Question 191 | Physics

JEE Main 2019 (Online) 10th January Evening Slot

MCQ (Single Correct Answer)

-1

Four equal point charges Q each are placed in the xy plane at (0, 2), (4, 2), (4, –2) and (0, –2). The work required to put a fifth charge Q at the origin of the coordinate system will be -

$${{{Q_2}} \over {4\pi {\varepsilon _0}}}$$

$${{{Q^2}} \over {2\sqrt 2 \pi {\varepsilon _0}}}$$

$${{{Q_2}} \over {4\pi {\varepsilon _0}}}\left( {1 + {1 \over {\sqrt 3 }}} \right)$$

$${{{Q_2}} \over {4\pi {\varepsilon _0}}}\left( {1 + {1 \over {\sqrt 5 }}} \right)$$

JEE Main 2019 (Online) 10th January Evening Slot

MCQ (Single Correct Answer)

-1

A current of 2 mA was passed through an unknown resistor which dissipated a power of 4.4 W. Dissipated power when an ideal power supply of 11 V is connected across it is -

11 $$ \times $$ 10^–5 W

11 $$ \times $$ 10^–3 W

11 $$ \times $$ 10⁵ W

11 $$ \times $$ 10^–4 W

JEE Main 2019 (Online) 10th January Evening Slot

MCQ (Single Correct Answer)

-1

The Wheatstone bridge shown in figure, here, gets balanced when the carbon resistor used as R₁ has the colour code (Orange, Red, Brown). The resistors R₂ and R₄ are 80$$\Omega $$ and 40$$\Omega $$, respectively. Assuming that the colour code for the carbon resistors gives their accurate values, the colour code for the carbon resistor, used as R₃, would be -

JEE Main 2019 (Online) 10th January Evening Slot Physics - Current Electricity Question 192 English

JEE Main 2019 (Online) 10th January Evening Slot Physics - Current Electricity Question 192 English

Brown, Blue, Brown

Grey, Black, Brown

Red, Green, Brown

Brown, Blue, Black

JEE Main 2019 (Online) 10th January Evening Slot

MCQ (Single Correct Answer)

-1

The actual value of resistance R, shown in the figure is 30$$\Omega $$. This is measuered in an experiment as shown using the standard formula R = $${V \over {\rm I}}$$, where V and I are the readings of the voltmeter and ammeter, respectively. If the measured value of R is 5% less, then the internal resistance of the voltmeter is -

JEE Main 2019 (Online) 10th January Evening Slot Physics - Current Electricity Question 191 English