Day 401: JEE Mains Physics

Gravitation. Asked once: 25 Jul 2022 (same type asked 8 times) See all 8 of this type

Units and Measurements. Asked once: 29 Jul 2022 (same type asked 8 times) See all 8 of this type

20

In an experiment to find out the diameter of wire using screw gauge, the following observation were noted: (A) Screw moves $0.5\text{ }mm$ on main scale in one complete rotation (B) Total divisions on circular scale $= 50$ (C) Main scale reading is $2.5\text{ }mm$ (D) $45^{\text{th~}}$ division of circular scale is in the pitch line (E) Instrument has $0.03\text{ }mm$ negative error Then the diameter of wire is:

1. A.
   $2.92\text{ }mm$
2. B.
   $2.54\text{ }mm$
3. C.
   $2.98\text{ }mm$
4. D.
   $3.45\text{ }mm$

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Moving Charges and Magnetism. Asked once: 10 Apr 2023 (same type asked 8 times) See all 8 of this type

115

A straight wire carrying a current of $14\text{ }A$ is bent into a semicircular arc of radius $2.2\text{ }cm$ as shown in the figure. The magnetic field produced by the current at the centre $(O)$ of the arc. is ___$\times10^{- 4}\text{ }T$

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Gravitation. Asked once: 12 Apr 2023 (same type asked 8 times) See all 8 of this type

Wave Optics. Asked once: 25 Jun 2022 (same type asked 8 times) See all 8 of this type