JEE Main 2019 (Online) 9th January Morning Slot | Current Electricity Question 201 | Physics

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

When the switch S, in the circuit shown, is closed, then the value of current i will be :

JEE Main 2019 (Online) 9th January Morning Slot Physics - Current Electricity Question 203 English

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

A resistance is shown in the figure. Its value and tolerance are given respectively by :

JEE Main 2019 (Online) 9th January Morning Slot Physics - Current Electricity Question 202 English

JEE Main 2019 (Online) 9th January Morning Slot Physics - Current Electricity Question 202 English

270 $$\Omega $$, 10 %

27 k$$\Omega $$, 10 %

27 k$$\Omega $$, 20 %

270 $$\Omega $$, 5 %

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm², is $$\upsilon $$. If the electron density in copper is 9 $$ \times $$ 10²⁸/m³ the value of $$\upsilon $$. in mm/s is close to (Take charge of electron to be = 1.6 $$ \times $$ 10^$$-$$19C)

0.02

0.2

JEE Main 2018 (Online) 16th April Morning Slot

MCQ (Single Correct Answer)

-1

A heating element has a resistance of 100 $$\Omega $$ at room temperature. When it is connected to a supply of 220 V, a steady current of 2 A passes in it and temperature is 500^oC more than room temperature. what is the temperature coefficient of resistance of the heating element ?

0.5 $$ \times $$ 10^$$-$$4 ^oC^$$-$$1

5 $$ \times $$ 10^$$-$$4 ^oC^$$-$$1

1 $$ \times $$ 10^$$-$$4 ^oC^$$-$$1

2 $$ \times $$ 10^$$-$$4 ^oC^$$-$$1

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