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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)
(a)
(a) and (c)
Only (c)
Only (d)
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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)
Both Assertion and Reason are true and the reason is the correct explanation of the assertion
Both Assertion and Reason are true, but the reason is not the correct explanation of the assertion
Assertion is a true statement, but Reason is false
Both Assertion and Reason are false statements
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)
(ii) & (iii)
Only (iii)
(iii) & (iv)
(i), (iii) & (iv)
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