A current loop in a magnetic field

(1) experiences a torque whether the field is uniform or non-uniform in all orientations

(2) can be in equilibrium in one orentations.

(3) can be equilibrium in two orientations, both the wquilibriu states are unstable

(4) can be in equilibrium in two orientations, one stable while the other is unstable



Subtopic:  Magnetic Field due to various cases | Current Carrying Loop: Force & Torque |
 67%
From NCERT
NEET - 2013
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Two similar coils of radius R are lying concentrically with their planes at right angles to each other. The currents flowing in them are I and 2I, respectively. The resultant magnetic field induction at the centre will be 

(1)5μ0I2R                                         

(2)3μ0I2R

(3)μ0I2R                                             

(4)μ0IR

Subtopic:  Magnetic Field due to various cases |
 79%
From NCERT
NEET - 2012
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A millivoltmeter of 25 mV range is to be converted into an ammeter of 25 A range. The value (in ohm) of necessary shunt will be:

(1)0.001                                     

(2)0.01

(3)1                                           

(4)0.05

Subtopic:  Conversion to Ammeter & Voltmeter |
 79%
From NCERT
NEET - 2012
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An alternating electric field of frequency v, is applied across the dees (radius=R) of a cyclotron that is being used to accelerate protons(mass=m).The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of the proton beam, produced by it, are given by

(1)B=mve and K=2mπ2v2R2

(2)B=2πmve and K=m2πvR2

(3)B=2πmve and K=2mπ2v2R2

(4)B=mve and K=m2πvR2

Subtopic:  Lorentz Force |
 74%
From NCERT
NEET - 2012
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A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in a uniform magnetic field. What should be the energy of an α-particle to describe a circle of the same radius in the same field?

1. 2 MeV                  2. 1 MeV

3. 0.5 MeV               4. 4 MeV

Subtopic:  Lorentz Force |
 80%
From NCERT
NEET - 2012
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A current-carrying closed loop in the form of a right-angle isosceles triangle ABC is placed in a uniform magnetic field acting along AB. If the magnetic force on the arm BC is F, the force on the arm AC is:

                         

1. -F                                               2. F

3. 2F                                             4. -2F

Subtopic:  Force between Current Carrying Wires | Current Carrying Loop: Force & Torque |
 64%
From NCERT
NEET - 2011
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A galvanometer of resistance, G is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is

(1) S2(S+G)                                             

(2) SG(S+G)

(3) G2(S+G)                                             

(4) G(S+G)

Subtopic:  Moving Coil Galvanometer |
From NCERT
NEET - 2011
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A square loop, carrying a steady current I, is placed in a horizontal plane near a long straight conductor carrying a steady current I1 at a distance d from the conductor as shown in figure. The loop will experience 

                    

(1) a net repulsive force away from the conductor 

(2) a net torque acting upward perpendicular to the horizontal plane

(3) a net torque acting downward normal to the horizontal plane

(4) a net attractive force towards the conductor 

Subtopic:  Force between Current Carrying Wires |
 78%
From NCERT
NEET - 2011
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Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the center of the ring is :

(1) μ0q f2R                                       

(2) μ0q2fR

(3) μ0q2πfR                                       

(4) μ0q f2πR

Subtopic:  Magnetic Field due to various cases |
 76%
From NCERT
NEET - 2011
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A beam of cathode rays is subjected to crossed Electric (E) and magnetic fields(B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by:

1. B22VE2                                             

2. 2VB2E2

3. 2VE2B2                                           

4. E22VB2

(where V is the potential difference between cathode and anode)

Subtopic:  Lorentz Force |
 58%
From NCERT
NEET - 2010
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