Assertion : Magnetic Resonance Imaging (MRI) is a useful diagnostic tool for producing images of var

English

Gujarati

Hindi

5.Magnetism and Matter

easy

Assertion : Magnetic Resonance Imaging $(MRI)$ is a useful diagnostic tool for producing images of various parts of human body.

Reason : Protons of various tissues of the human body play a role in $(MRI)$.

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

If the Assertion is correct but Reason is incorrect.

If both the Assertion and Reason are incorrect.

(AIIMS-2006)

Solution

$MRI$ is useful diagnostic tool for producing images of various parts of human body because it makes use of magnetic property of spinning proton inside the nucleus.

Standard 12

Physics

If the number of turns and radius of cross section of the coil of a tangent galvanometer are doubled, then the reduction factor $K$ will become

easy

When $2 $ $amperes$ current is passed through a tangent galvanometer, it gives a deflection of $30^o$. For $60^o$ deflection, the current must be……..$amp$

medium

The error in measuring the current with a tangent galvanometer is minimum when the deflection is about…..$^o$

hard

A certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of $ 45°.$ If the current be reduced by a factor of $\sqrt 3 $, the deflection would

hard

Two tangent galvanometer coils of same radius connected in series. The current flowing produces deflection of $60^o$ and $45^o$. The ratio of number of turns in coil is