A long vertical wire in which a current is flowing produces a neutral point with earth's magneti

English

Gujarati

Hindi

5.Magnetism and Matter

medium

A long vertical wire in which a current is flowing produces a neutral point with the earth's magnetic field at a distance of $5\, cm$ from the wire. If the horizontal component of the earth's magnetic induction is $0.18\, gauss$, then the curent in the wire is......$A$

A

$0.45$

B

$4.5$

C

$0.9$

D

$0.036$

Solution

$B = \frac{{{\mu _0}I}}{{2\pi R}} = {B_H}$

Standard 12

Physics

Share

Similar Questions

A tangent galvanometer shows a deflection $45^o $ when $10\, mA$ current pass through it. If the horizontal component of the earth’s field is $3.6 \times {10^{ – 5}}\,T$ and radius of the coil is $10\, cm$. The number of turns in the coil is……$turns$

medium

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 $(MRI)$.

easy

(AIIMS-2006)

The time period of a vibration magnetometer is $T_0$. Its magnet is replaced by another magnet whose moment of inertia is $3$ $times$ and magnetic moment is $1/3$ of the initial magnet. The time period now will be

medium

A tangent galvanometer has a coil of $25$ $turns$ and radius of $15 \,cm.$ The horizontal component of the earth’s magnetic field is $3 × 10^{-5}$ $T$. The current required to produce a deflection of $45^o$ in it, is…..$A$

medium

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

hard