A coil of one loop is made from a wire of length L and thereafter a coil of two loops is made from same wire. The ratio of magnetic field at the centre of the coils will be:
1.  1 : 4
2.  1 : 1
3.  1 : 8
4.  4 : 1

Subtopic:  Magnetic Field due to various cases |
 75%
From NCERT
AIPMT - 1998
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Resistance of a Galvanometer coil is \(8~\Omega\) and \(2~\Omega\) shunt resistance is connected with it. If main current is \(1\) A then the current flow through \(2~\Omega\) resistance will be:
1. \(0.2\) A
2. \(0.8\) A
3. \(0.1\) A
4. \(0.4\) A

Subtopic:  Moving Coil Galvanometer |
 73%
From NCERT
AIPMT - 1998
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Two long parallel wires are at a distance of \(1\) m. If both of them carry one ampere of current in the same direction, then the force of attraction on the unit length of the wires will be:
1. \(2\times10^{-7}\) N/m
2. \(4\times10^{-7}\) N/m
3. \(8\times10^{-7}\) N/m
4. \(10^{-7}\) N/m

Subtopic:  Force between Current Carrying Wires |
 82%
From NCERT
AIPMT - 1998
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A current-carrying coil (I = 5A, R = 10 cm) has 50 turns. The magnetic field at its centre will be:
1.  1.57 mT
2.  3.14 mT
3.  1 mT
4.  2 mT

Subtopic:  Magnetic Field due to various cases |
 72%
From NCERT
AIPMT - 1999
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Two identically charged particles A and B initially at rest, are accelerated by a common potential difference V. They enter into a transverse uniform magnetic field B. If they describe a circular path of radii  r1 and r2 respectively, then their mass ratio is:

1.  (r1r2)2

2. (r2r1)2

3. (r1r2)

4. (r2r1)

Subtopic:  Lorentz Force |
 66%
From NCERT
AIPMT - 1999
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For the adjoining figure, the magnetic field at a point 'P' will be:

1. μ04π

2. μ0π

3. μ02π

4. μ02π

Subtopic:  Magnetic Field due to various cases |
 76%
From NCERT
AIPMT - 2000
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A charge having q/m equal to 108 c/kg and with velocity 3 × 105 m/s enters into a uniform magnetic field B = 0.3 tesla at an angle 30º with the direction of field. Then the radius of curvature will be:

1. 0.01 cm

2. 0.5 cm

3. 1 cm

4. 2 cm

Subtopic:  Lorentz Force |
 68%
From NCERT
AIPMT - 2000
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An electron having mass 'm' and kinetic energy E enter in a uniform magnetic field B perpendicularly. Its frequency will be:

1. eEqVB

2. 2πmeB

3. eB2πm

4. 2meBE

Subtopic:  Lorentz Force |
 84%
From NCERT
AIPMT - 2001
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In the Thomson mass spectrograph where EB the velocity of the undeflected electron beam will be:

1.  \(\frac{\left| \vec{E}\right|}{\left|\vec{B} \right|}\)
2. \(\vec{E}\times \vec{B}\)
3. \(\frac{\left| \vec{B}\right|}{\left|\vec{E} \right|}\)
4. \(\frac{E^{2}}{B^{2}}\)

Subtopic:  Lorentz Force |
 76%
From NCERT
AIPMT - 2001
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The tangent galvanometer is used to measure: 
1.  Potential difference
2.  Current
3.  Resistance
4.  In measuring the charge

Subtopic:  Moving Coil Galvanometer |
 67%
From NCERT
AIPMT - 2001
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