Select Chapter Topics:

Moving perpendicular to field B, a proton and an alpha particle both enter an area of uniform magnetic field B. If the kinetic energy of the proton is 1 MeV and the radius of the circular orbits for both particles is equal, the energy of the alpha particle will be:

1. 4 MeV

2. 0.5 MeV

3. 1.5 MeV

4. 1 MeV

Subtopic: Lorentz Force |

70%

From NCERT

NEET - 2015

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

Hints

Links

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 Wb/m^{2}. The coil carries a current of 2 A. If the plane of the coil is inclined at an angle of 30^{o} with the direction of the field, the torque required to keep the coil in stable equilibrium will be:

1. 0.15 N-m

2. 0.20 N-m

3. 0.24 N-m

4. 0.12 N-m

Subtopic: Current Carrying Loop: Force & Torque |

From NCERT

NEET - 2015

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

Hints

Links

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

A wire carrying current I has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X-axis while the semicircular portion of radius R is lying in the Y –Z plane. The magnetic field at point O is:

1. \(B=\frac{\mu i }{4\pi R}\left ( \pi \hat{i}+2\hat{k} \right )\)

2. \(B=-\frac{\mu i }{4\pi R}\left ( \pi \hat{i}-2\hat{k} \right )\)

3. \(B=-\frac{\mu i }{4\pi R}\left ( \pi \hat{i}+2\hat{k} \right )\)

4. \(B=\frac{\mu i }{4\pi R}\left ( \pi \hat{i}-2\hat{k} \right )\)
2. \(B=-\frac{\mu i }{4\pi R}\left ( \pi \hat{i}-2\hat{k} \right )\)

3. \(B=-\frac{\mu i }{4\pi R}\left ( \pi \hat{i}+2\hat{k} \right )\)

Subtopic: Magnetic Field due to various cases |

65%

From NCERT

NEET - 2015

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

Hints

Links

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has a magnitude:

1. μ_{0}ne/2πr

2. zero

3. n^{2}e/r

4. μ_{0}ne/2r

Subtopic: Magnetic Field due to various cases |

64%

From NCERT

NEET - 2015

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

Hints

Links

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

In an ammeter, \(0.2 \%\) of the main current passes through the galvanometer. If the resistance of the galvanometer is \(G,\) the resistance of the ammeter will be:

1. | \({1 \over 499}G\) | 2. | \({499 \over 500}G\) |

3. | \({1 \over 500}G\) | 4. | \({500 \over 499}G\) |

Subtopic: Conversion to Ammeter & Voltmeter |

52%

From NCERT

AIPMT - 2014

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

Hints

Links

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

Two identical long conducting wires AOB and COD are placed at a right angle to each other, with one above the other such that 'O' is the common point for the two. The wires carry I_{1} and *I*_{2} currents, respectively.
Point 'P' is lying at a distance 'd' from 'O' along a direction perpendicular to the plane containing the wires. What will be the magnetic field at the point "P"?

1. $\frac{{\mu}_{0}}{2\mathrm{\pi d}}\left(\frac{{I}_{1}}{{I}_{2}}\right)$

2. $\frac{{\mu}_{0}}{2\mathrm{\pi d}}\left({I}_{1}+{I}_{2}\right)$

3. $\frac{{\mu}_{0}}{2\mathrm{\pi d}}\left({I}_{1}^{2}+{I}_{2}^{2}\right)$

4. $\frac{{\mu}_{0}}{2\mathrm{\pi d}}{\left({I}_{1}^{2}+{I}_{2}^{2}\right)}^{1/2}$

Subtopic: Magnetic Field due to various cases |

75%

From NCERT

AIPMT - 2014

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

Hints

Links

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

A current loop in a magnetic field:

1. | can be in equilibrium in one orientation. |

2. | can be in equilibrium in two orientations, both the equilibrium states are unstable. |

3. | can be in equilibrium in two orientations, one stable while the other is unstable. |

4. | experiences a torque whether the field is uniform or non-uniform in all orientations. |

Subtopic: Magnetic Field due to various cases | Current Carrying Loop: Force & Torque |

73%

From NCERT

AIPMT - 2013

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

Hints

Links

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

When a proton is released from rest in a room, it starts with an initial acceleration a_{0} towards the east. When it is projected towards the north with a speed of v_{0}, it moves with an initial acceleration of 3a_{0} towards the east. What are the electric and magnetic fields in the room?

1. | \(\frac{M a_0}{e} \text { west, } \frac{M a_0}{e v_0} u p\) |

2. | \(\frac{M a_0}{e} \text { west, } \frac{2 M a_0}{e v_0} \text { down }\) |

3. | \(\frac{M a_0}{e} \text { east, } \frac{2 M a_0}{e v_0} u p\) |

4. | \(\frac{M a_0}{e} \text { east, } \frac{3 M a_0}{e v_0} \text { down }\) |

Subtopic: Lorentz Force |

55%

From NCERT

AIPMT - 2013

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

Hints

Links

To view explanation, please take trial in the course.

NEET 2023 - Target Batch - Aryan Raj Singh

A long straight wire carries a certain current and produces a magnetic field \(2 \times 10^{-4} \) Wb/m^{2} at a perpendicular distance of \(5\) cm from the wire. An electron situated at \(5\) cm from the wire moves with a velocity \(10^7 \) m/s towards the wire along perpendicular to it. The force experienced by the electron will be:

(Charge on electron = \(1.6 \times 10^{-19} \) C)

1. \(3.2\) N

2. \(3.2 \times 10^{-16} \) N

3. \(1.6 \times 10^{-16} \) N

4. zero

(Charge on electron = \(1.6 \times 10^{-19} \) C)

1. \(3.2\) N

2. \(3.2 \times 10^{-16} \) N

3. \(1.6 \times 10^{-16} \) N

4. zero

Subtopic: Lorentz Force |

70%

From NCERT

NEET - 2013

Please attempt this question first.

Hints

Please attempt this question first.

A circular coil \(\text {ABCD}\) carrying a current \(\text{i}\) is placed in a uniform magnetic field. If the magnetic force on the segment \(\text {AB}\) is \(\vec F\) the force on the remaining segment \(\text {BCDA}\) is:

1. \(-\vec F\)

2. \(3\vec F\)

3. \(-3\vec F\)

4. \(\vec F\)

1. \(-\vec F\)

2. \(3\vec F\)

3. \(-3\vec F\)

4. \(\vec F\)

Subtopic: Current Carrying Loop: Force & Torque |

76%

From NCERT

NEET - 2013

Please attempt this question first.

Hints

Please attempt this question first.