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Q. No.A charged particle enters perpendicular to a uniform magnetic field. Which of the following statements is true for the charged particle?
1.
kinetic energy changes
2.
kinetic energy remains constant
3.
speed changes
4.
momentum remains constant
Subtopic: Lorentz Force |
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Given below are two statements:
| Statement I: | The electric force changes the speed of the charged particle and hence changes its kinetic energy: whereas the magnetic force does not change the kinetic energy of the charged particle. |
| Statement II: | The electric force accelerates the positively charged particle perpendicular to the direction of electric field. The magnetic force accelerates the moving charged particle along the direction of magnetic field. |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Statement I is correct and Statement II is incorrect. |
| 4. | Statement I is incorrect and Statement II is correct. |
Subtopic: Lorentz Force |
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The current sensitivity of a galvanometer can be increased by:
Choose the most appropriate answer from the options given below:
| A. | decreasing the number of turns. |
| B. | increasing the magnetic field. |
| C. | decreasing the area of the coil. |
| D. | decreasing the torsional constant of the spring. |
Choose the most appropriate answer from the options given below:
| 1. | (B) and (C) only |
| 2. | (C) and (D) only |
| 3. | (A) and (C) only |
| 4. | (B) and (D) only |
Subtopic: Moving Coil Galvanometer |
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Given below are two statements:
| Assertion (A): | Magnetic field due to an infinite straight conductor varies inversely as the distance from it. |
| Reason (R): | The magnetic field at the center of the circular coil is zero. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Magnetic Field due to various cases |
79%
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The ratio of the radii of two circular coils is \(1:2\). The ratio of currents in the respective coils such that the same magnetic moment is produced at the centre of each coil is:
1. \(4:1\)
2. \(2:1\)
3. \(1:2\)
4. \(1:4\)
Subtopic: Magnetic Moment |
61%
From NCERT
NEET - 2022
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Given below are two statements:
| Assertion (A): | If a proton and an \(\alpha\)-particle enters a uniform magnetic field perpendicularly with the same speed, then the time period of revolution of the \(\alpha\)-particle is double that of a proton. |
| Reason (R): | In a magnetic field, the time period of revolution of a charged particle is directly proportional to mass. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Lorentz Force |
66%
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A straight wire carrying a current of 12 A is bent into a semi-circular arc of radius 2.0 cm as shown in the figure. Considering the magnetic field B at the centre of the arc, what will be the magnetic field due to the straight segments?
Subtopic: Biot-Savart Law |
78%
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An element \(\Delta l=\Delta x \hat{i}\) is placed at the origin and carries a large current of \(I=10\) A (as shown in the figure). What is the magnetic field on the y-axis at a distance of \(0.5\) m?(\(\Delta x=1~\mathrm{cm}\))
| 1. | \(6\times 10^{-8}~\mathrm{T}\) | 2. | \(4\times 10^{-8}~\mathrm{T}\) |
| 3. | \(5\times 10^{-8}~\mathrm{T}\) | 4. | \(5.4\times 10^{-8}~\mathrm{T}\) |
Subtopic: Biot-Savart Law |
80%
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A long solenoid carrying a current produces a magnetic field \(B\) along its axis.
If the current is doubled and the number of turns per cm is halved, what will be the new value of the magnetic field?
1. \(B/2\)
2. \(B\)
3. \(2B\)
4. \(4B\)
Subtopic: Ampere Circuital Law |
89%
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AIPMT - 2003
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What properties will a galvanometer that is acting as a voltmeter have?
| 1. | high resistance in series with its coil | 2. | low resistance in parallel with its coil |
| 3. | low resistance in series with its coil | 4. | high resistance in parallel with its coil |
Subtopic: Conversion to Ammeter & Voltmeter |
77%
From NCERT
AIPMT - 2004
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NEET 2023 - Target Batch - Aryan Raj Singh
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