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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
1
Medium
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Understanding
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This question has Statement I and Statement II. Of the four choices given after the statements, choose the one that best describes the two statements.
Statement I Higher the range, greater is the resistance of ammeter.
Statement II To increase the range of ammeter, additional shunt needs to be used across it.
Statement I Higher the range, greater is the resistance of ammeter.
Statement II To increase the range of ammeter, additional shunt needs to be used across it.
View answer and explanation
Correct option: D
Statement I is false, Statement II is true
Option D (Statement I is false, Statement II is true) is correct because a higher range ammeter has lower resistance, and a shunt is used to increase the range.
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Reason: Velocity of charge particle is not changing in magnetic field. Pick out the wrong statement : A steady current is flowing in a circular coil of radius , made up of a thin conducting wire. The magnetic field at the center of the loop is . Now, a circular loop of radius is made from the same wire without changing its length, by unfolding and refolding the loop, and the same current is passed through it. If new magnetic field at the center of the coil is , then the ratio is Lorentz force can be calculated by using the formula Two particles and having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular path of radius and respectively. The ratio of mass of to that of is :
