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Physics - Magnetic Effects Of Current

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61. Four situations are given below
(a) An infinitely long wire carrying current
(b) A rectangular loop carrying current
(c) A solenoid of finite length carrying current
(d) A circular loop carrying current
In which of the above cases will the magnetic field produced be like that of a bar magnet? (NTSE Stage-II, 2015-16)

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62. Assertion (A): Motion of a charged particle under the action of a magnetic field alone is always with constant speed.
Reason (R): The magnetic force does not have any component either along or opposite to the direction of motion of the charged particle. (NTSE Stage-II, 2015-16)

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63. When a charged particle passes through an electric field, which among the following properties change?
(i) Mass
(ii) Charge
(iii) Velocity
(iv) Momentum (NTSE Stage-II, 2015-16)

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