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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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A galvanometer having 30 divisions has a current sensitivity of

20 \mu \mathrm{A} /

division. It has a resistance of

20\,\Omega

. How will you convert it into an ammeter measuring upto 1 ampere? How will you convert this ammeter into voltmeter reading upto 1 volt?

View answer and explanation

Correct option: A

0.15\,\Omega;\,\,0.985\,\Omega

Option A (

0.15 \Omega;\,\,0.985 \Omega

) is correct because it provides the correct shunt resistance for the ammeter and series resistance for the voltmeter conversion.

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A needle made of bismuth is suspended freely in a magnetic field. The angle which the needle makes with the magnetic field is: Assertion: If a charged particles is moving in perpendicular uniform magnetic field, its kinetic energy does not change
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B_C

, then the ratio

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is Lorentz force can be calculated by using the formula Two particles

X

Y

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R_1

R_2

respectively. The ratio of mass of

{X}

{Y}