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NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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Statement I: An electron moving in the positive -direction enters a region where uniform electric and magnetic fields exist perpendicular to each other. The electric field is in the negative -direction. If the electron travels undeflected in this region, the direction of the magnetic field is along the negative -axis.
Statement II: If a charged particle moves in a direction perpendicular to a magnetic field, the direction of the force acting on it is given by Fleming's left hand rule.
Statement II: If a charged particle moves in a direction perpendicular to a magnetic field, the direction of the force acting on it is given by Fleming's left hand rule.
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Correct option: B
Statement I is true, Statement II is true; Statement II is not the correct explanation for Statement I
Option C (Both and are constant) is correct because the radius of the circular path depends on both velocity and magnetic field strength, and both must be constant for the radius to remain constant.
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Which of the following statements is not true
A current loop in a magnetic field
Given below are two statements:
Statement (I): When currents vary with time, Newton’s third law is valid only if momentum carried by the electromagnetic field is taken into account.
Statement (II): Ampere's circuital law does not depend on Biot-Savart’s law.
In the light of the above statements, choose the correct answer from the options given below: The magnetic field due to current carrying a circular loop of radius at a point on the axis at a distance of from the center is . The magnetic field at the center of the loop is The magnetic field due to a small current element at distance and element carrying current is Three long straight conductors carry currents 4A, 2A and 3A into the plane of paper. A circular path is imagined to be enclosing these currents. The value of b is
Statement (I): When currents vary with time, Newton’s third law is valid only if momentum carried by the electromagnetic field is taken into account.
Statement (II): Ampere's circuital law does not depend on Biot-Savart’s law.
In the light of the above statements, choose the correct answer from the options given below: The magnetic field due to current carrying a circular loop of radius at a point on the axis at a distance of from the center is . The magnetic field at the center of the loop is The magnetic field due to a small current element at distance and element carrying current is Three long straight conductors carry currents 4A, 2A and 3A into the plane of paper. A circular path is imagined to be enclosing these currents. The value of b is