An electron mass 9×10-31 kg and charge 1.6×10-19 C is moving at a speed of 3 ×107 m/s in a magnetic field perpendicular to it. The energy of the electron in keV is: ( 1 eV = 1.6 × 10–19 J)

1. 2.5 keV

2. 3.5 keV

3. 20 keV

4. 3.0 keV

Subtopic:  Lorentz Force |
 62%
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NEET 2023 - Target Batch - Aryan Raj Singh
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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 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?

         

1. 0
2. 1.2×10-4 T
3. 2.1×10-4 T
4. None of these

Subtopic:  Biot-Savart Law |
 78%
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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. Consider the magnetic field B at the centre of the arc. What is the magnetic field at centre due to the semi-circular loop?

 

1. 0
2. 3.8×10-4 T
3. 1.9×10-4 T
4. 2.9×10-4 T

Subtopic:  Biot-Savart Law |
 65%
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NEET 2023 - Target Batch - Aryan Raj Singh
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Consider a tightly wound \(100\) turn coil of radius \(10\) cm, carrying a current of \(1\) A. What is the magnitude of the magnetic field at the centre of the coil?
1. \(8.2\times10^{-4}\) T
2. \(4.6\times10^{-4}\) T
3. \(5.2\times10^{-4}\) T
4. \(6.2\times10^{-4}\) T

Subtopic:  Magnetic Field due to various cases |
 78%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

The figure shows a long straight wire of a circular cross-section (radius a) carrying steady current I. The current I is uniformly distributed across this cross-section. If the magnetic field in the region (a) is B1 and for (a) is B2, then B1B2 is:

1. ar
2. a2r2
3. r2a2
4. ra

Subtopic:  Magnetic Field due to various cases |
 50%
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A solenoid of length 0.5 m has a radius of 1 cm and is made up of 500 turns. It carries a current of 5 A. What is the magnitude of the magnetic field inside the solenoid?

1. 6.28×10-3 T
2. 3.14×10-3 T
3. 2.72×10-3 T
4. 5.17×10-3 T

Subtopic:  Magnetic Field due to various cases |
 74%
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The horizontal component of the earth’s magnetic field at a certain place is \(3.0\times10^{-5}~\text{T}\) and the direction of the field is from the geographic south to the geographic north. A very long straight conductor is carrying a steady current of \(1~\text{A}\). What is the force per unit length on it when it is placed on a horizontal table and the direction of the current east to west?
1. \(3\times10^{-5}~\text{N m}^{-1}\)
2. \(2\times10^{-7}~\text{N m}^{-1}\)
3. zero
4. \(5\times10^{-7}~\text{N m}^{-1}\)

Subtopic:  Force between Current Carrying Wires |
 64%
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The horizontal component of the earth’s magnetic field at a certain place is 3.0 ×10–5 T and the direction of the field is from the geographic south to the geographic north. A very long straight conductor is carrying a steady current of 1 A. What is the force per unit length on it when it is placed on a horizontal table and the direction of the current is south to north?

1. 3×10-5 N m-1
2. 2×10-7 N m-1
3. 0
4. 5×10-7 N m-1

Subtopic:  Force between Current Carrying Wires |
 70%
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A \(100\) turn closely wound circular coil of radius \(10~\text{cm}\) carries a current of \(3.2~\text{A}\). The magnetic field at the centre of the coil is:
1. \(4\times10^{-3}~\text{T}\)
2. \(6\times10^{-3}~\text{T}\)
3. \(2\times10^{-3}~\text{T}\)
4. \(5\times10^{-3}~\text{T}\)

Subtopic:  Magnetic Field due to various cases |
 71%
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