JEE Main 2019 (Online) 9th April Evening Slot | Current Electricity Question 230 | Physics

The resistance of a galvanometer is 50 ohm and the maximum current which can be passed through it is 0.002 A. What resistance must be connected to it in order to convert it into an ammeter of range 0 – 0.5 A ?

0.02 ohm

0.2 ohm

0.002 ohm

0.5 ohm

JEE Main 2019 (Online) 9th April Evening Slot

MCQ (Single Correct Answer)

-1

In a conductor, if the number of conduction electrons per unit volume is 8.5 × 10²⁸ m^–3 and mean free time is 25ƒs (femto second), it's approximate resistivity is :-
(m_e = 9.1 × 10^–31 kg)

10^–8 $$\Omega $$m

10^–7 $$\Omega $$m

10^–5 $$\Omega $$m

10^–6 $$\Omega $$m

JEE Main 2019 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

A wire of resistance R is bent to form a square ABCD as shown in the figure. The effective resistance between E and C is : (E is mid-point of arm CD) JEE Main 2019 (Online) 9th April Morning Slot Physics - Current Electricity Question 233 English

JEE Main 2019 (Online) 9th April Morning Slot Physics - Current Electricity Question 233 English

$${7 \over {64}}R$$

$${1 \over {16}}R$$

$${3 \over {4}}R$$

JEE Main 2019 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

A moving coil galvanometer has resistance 50$$\Omega $$ and it indicates full deflection at 4mA current. A voltmeter is made using this galvanometer and a 5 k$$\Omega $$ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to :

15 V

10 V

40 V

20 V

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