The same current i = 2A is flowing in a wireframe as shown in the figure. The frame is a combination of two equilateral triangles ACD and CDE of side 1m. It is placed in uniform magnetic field B = 4T acting perpendicular to the plane of the frame. The magnitude of the magnetic force acting on the frame is:

                        

1. 24 N                                         2. Zero

3. 16 N                                         4. 8 N

Concept Questions :-

Lorentz force
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In the given figure net magnetic field at O will be 

                    

(a) 2μ0i3πa4-x2                                 (b) μ0i3πa4+x2

(c) 2μ0i3πa4+x2                                  (d) 2μ0i3πa4-π2

Concept Questions :-

Magnetic field due to various cases
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In the following figure a wire bent in the form of a regular polygon of n sides is inscribed in a circle of radius a. Net magnetic field at centre will be

                               

(a) μoi2πatanπn                                                (b) μ0ni2πatanπn

(c)2πniaμ0tanπn                                             (d) ni2aμ0tanπn

Concept Questions :-

Magnetic field due to various cases
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The unit vectors i^, j^ and k^ are as shown below. What will be the magnetic field at O in the following figure?

(a) μ04πia2-π2j^             (b) μ04πia2+π2j^

(c) μ04πia2+π2i^              (d) μ04πia2+π2k^ 

Concept Questions :-

Magnetic field due to various cases
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A particle of charge q and mass m moves in a circular orbit of radius r with angular speed ω . The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on

(a) ω and q                        (b) ω q and m

(c) q and m                        (d) ω and m

Concept Questions :-

Magnetic moment
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An elastic circular wire of length L carries a current I. It is placed in a uniform magnetic field B (out of paper) such that its plane is perpendicular to the direction of B . The wire will experience

 

(a) No force                            (b) A stretching force

(c) A compressive force            (d) A torque

Concept Questions :-

Current carrying loop : Force and torque
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Wires 1 and 2 carrying currents i1 and i2 respectively are inclined at an angle θ to each other. What is the force on a small element dl of wire 2 at a distance of r from wire 1 (as shown in figure) due to the magnetic field of wire 1

                                       

(a) μ02πri1i2dl tanθ                              (b) μ02πri1i2dl sinθ

(c) μ02πri1i2dl cosθ                               (d) μ04πri1i2dl sinθ

Concept Questions :-

Force between current carrying wires
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A conducting loop carrying a current I is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to

                                    

(a) Contract                                        (b) Expand 

(c) Move towards +ve x -axis               (d) Move towards -ve x -axis

Concept Questions :-

Current carrying loop : Force and torque
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A current-carrying loop is placed in a uniform magnetic field in four different orientations, I, II, III & IV. The decreasing order of potential energy is :

               

(a) I > III > II > IV                               (b) I > II >III > IV
(c) I > IV > II > III                               (d) III > IV > I > II

 

Concept Questions :-

Current carrying loop : Force and torque
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A metallic block carrying current I is subjected to a uniform magnetic induction B as shown in the figure. The moving charges experience a force given F by ........... which results in the lowering of the potential of the face ........ Assume the speed of the carriers to be v

                   

(a) eVBk^ , ABCD                                (b) eVBk^ , EFGH

(c) -eVBk^ , ABCD                              (d) -eVBk^ , EFGH

Concept Questions :-

Lorentz force
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