Explore popular questions from Magnetic Effects of Current and Magnetism for JEE Advanced. This collection covers Magnetic Effects of Current and Magnetism previous year JEE Advanced questions hand picked by experienced teachers.

## Chemistry

Magnetic Effects of Current and Magnetism

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Q 1. An infinitely long conductor {tex} P Q R {/tex} is bent to form a right angle as shown in diagram. A current {tex} I {/tex} flows through {tex} P Q R {/tex}. The magnetic field due to this current at the point {tex} M {/tex} is {tex} H _ { 1 } {/tex}. Now, another infinitely long straight conductor {tex} Q S {/tex} is connected at {tex} Q {/tex} so that current is {tex} I / 2 {/tex} in {tex} Q R {/tex} as well as in {tex} Q S , {/tex} the current in {tex} P Q {/tex} remaining unchanged. The magnetic field at {tex} M {/tex} is now {tex} H _ { 2 } . {/tex} The ratio {tex} H _ { 1 } / H _ { 2 } {/tex} is given by

A

{tex} 1 / 2 {/tex}

B

{tex}1{/tex}

{tex} 2 / 3 {/tex}

D

{tex}2{/tex}

##### Explanation

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Q 2. The magnetic field lines due to a bar magnet are correctly shown in

A

B

C

##### Explanation

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Q 3. An electron travelling with a speed u along the positive {tex} x - {/tex} axis enters into a region of magnetic field where {tex} B = - B _ { 0 } \hat { k } {/tex} {tex} ( x /> 0 ) . {/tex} It comes out of the region with speed v then

A

{tex} v = u {/tex} at {tex} y > 0 {/tex}

{tex} v = u {/tex} at {tex} y < 0 {/tex}

C

{tex} v > u {/tex} at {tex} y > 0 {/tex}

D

{tex} v > u {/tex} at {tex} y < 0 {/tex}

##### Explanation

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Q 4. A magnetic field {tex} \vec { B } = B _ { 0 } \hat { J } , {/tex} exists in the region a {tex} < x < 2 a {/tex}, and {tex} \bar { B } = - B _ { 0 } \hat { j } , {/tex} in the region {tex} 2 a < x < 3 a {/tex}, where {tex} B _ { 0 } {/tex} is a positive constant. A positive point charge moving with a velocity {tex} \vec { v } = v _ { 0 } \hat { i } , {/tex} where {tex} v _ { 0 } {/tex} is a positive constant, enters the magnetic field at {tex} x = a . {/tex} The trajectory of the charge in this region can be like

B

C

D

##### Explanation

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Q 5. An infinitely long hollow conducting cylinder with inner radius {tex} R / 2 {/tex} and outer radius {tex} R {/tex} carries a uniform current density along its length. The magnitude of the magnetic field, {tex} | \vec { B } | {/tex} as a function of the radial distance {tex} r {/tex} from the axis is best represented by

A

B

C