The electric charge in uniform motion produces :

(1) An electric field only

(2) A magnetic field only

(3) Both electric and magnetic field

(4) Neither electric nor magnetic field

Subtopic:  Lorentz Force |
 78%
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PMT - 1971
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An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of i amperes and the radius of the circular loop is r metres. What will be the magnetic induction at its centre?
                 

1. μ04π2ir(π+1)
2. μ04π2ir(π-1)
3. Zero
4. Infinite

Subtopic:  Magnetic Field due to various cases |
 62%
From NCERT
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A current \(i\) ampere flows in a circular arc of wire whose radius is \(R,\) which subtend an angle 3π2 radian at its centre. The magnetic induction \(B\) at the centre is:
1. \(\frac{\mu_0i}{R}\)
2. \(\frac{\mu_0i}{2R}\)
3. \(\frac{2\mu_0i}{R}\)
4. \(\frac{3\mu_0i}{8R}\)

Subtopic:  Magnetic Field due to various cases |
 87%
From NCERT
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A straight section PQ of a circuit lies along the X-axis from x=-a2 to x= a2 and carries a steady current i. The magnetic field due to the section PQ at a point X = + a will be:


1. Proportional to a             2. Proportional to a2
3. Proportional to 1a           4. Zero

Subtopic:  Magnetic Field due to various cases |
 67%
From NCERT
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The magnetic induction at point P, which is 4 cm from a long current-carrying wire is 10-8 Tesla. What would be the field of induction at a distance of 12 cm from the same current?

1. 3.33 x 10-9 Tesla   
2. 1.11 x 10-4 Tesla
3. 3 x 10-3 Tesla
4. 9 x 10-2 Tesla


 

Subtopic:  Magnetic Field due to various cases |
 81%
From NCERT
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Two straight horizontal parallel wires carry the same current in the same direction, and d is the distance between them. You are given a small magnetic needle that is freely suspended. Which of the following positions will have the needle's orientation independent of the magnitude of the current in the wires?

1. At a distance d/2 from any of the wires in any plane.
2. At a distance d/3 from any of the wires in the horizontal plane.
3. Anywhere on the circumference of a vertical circle of radius d and centre halfway between the wires.
4. At points halfway between the wires in the horizontal plane.
Subtopic:  Magnetic Field due to various cases |
 55%
From NCERT
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A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as 

1. 1r                                          

2. 1r3/2

3. 1r2                                          

4. 1r3 

Subtopic:  Magnetic Field due to various cases |
 61%
From NCERT
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The magnetic induction due to an infinitely long straight wire carrying a current \(i\) at a distance \(r\) from the wire is given by:
1. \( B =\frac{\mu_0}{4 \pi} \frac{2 i}{r} \)
2. \(B =\frac{\mu_0}{4 \pi} \frac{r}{2 i} \)
3. \(B =\frac{4 \pi}{\mu_0} \frac{2 i}{r} \)
4. \(B =\frac{4 \pi}{\mu_0} \frac{r}{2 i}\)

Subtopic:  Magnetic Field due to various cases |
 94%
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The magnetic induction at the centre O in the figure shown is:                                                   

 1. μ0i41R1-1R2                                   2. μ0i41R1+1R2                                                         

 3. μ0i 4R1-R2                                      4. μ0i4R1+R2       

                        

 

Subtopic:  Magnetic Field due to various cases |
 88%
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In the figure shown, the magnetic induction at the centre of the arc due to the current in portion AB will be

(a) μ0ir                       (c)  μ0i4r

(b) μ0i2r                        (d) Zero

Subtopic:  Magnetic Field due to various cases |
 58%
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