Class 12

22. Moving Charges And Magnetism question bank (Physics)

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Q1.

When a magnetic compass needle is carried nearby to a straight wire carrying current, then  
(I) The straight wire cause a noticeable deflection in the compass needle.  
(II) The alignment of the needle is tangential to an imaginary circle with straight wire as its centre and has a plane perpendicular to the wire  

(A)
(I) is correct
(B)
(II) is correct
(C)
Both (I) and (II) are correct
(D)
Neither (I) nor (II) is correct
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Q2.

When one of the following is not correct about Lorentz Force?  

(A)
In presence of electric field \( \vec{E}(r) \) and magnetic field \( \vec{B}(r) \) the force on a moving electric charge is \( \vec{F} = q \left[ \vec{E}(r) + \vec{v} \times \vec{B}(r) \right] \)
(B)
The force, due to magnetic field on a negative charge is opposite to that on a positive charge.
(C)
The force due to magnetic field become zero if velocity and magnetic field are parallel or anti-parallel.
(D)
For a static charge the magnetic force is maximum.
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