Magnetism and magnetic effects of electric current Additional

12th Standard Physics — Magnetism and magnetic effects of electric current: Additional Online Practice Test

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What is the term for the angle between the magnetic meridian at a point and the geographical meridian?

A.Dip B.Declination C.Inclination D.Horizontal component

A bar magnet with magnetic dipole moment \(p_m\) is cut into two equal pieces along its axis. What is the new magnetic moment of each piece?

A.\(p_m\) B.\(2p_m\) C.\(p_m / 2\) D.\(p_m / 4\)

According to Coulomb's inverse square law of magnetism, what happens to the force between two poles if the distance between them is doubled?

A.It is doubled B.It is halved C.It increases four times D.It reduces to one-fourth

In which orientation does a magnetic dipole possess maximum potential energy in a uniform magnetic field?

A.Parallel to the field B.Perpendicular to the field C.Anti-parallel to the field D.At 45 degrees to the field

Which of the following is true for diamagnetic materials when placed in a non-uniform magnetic field?

A.They move from weaker to stronger field parts B.They have positive susceptibility C.They move from stronger to weaker field parts D.Their atoms have a net magnetic moment

According to Curie's law, how does the magnetic susceptibility of a paramagnetic material change as its temperature increases?

A.It increases linearly B.It remains constant C.It increases exponentially D.It decreases

What does the area of a hysteresis loop represent for a magnetic material?

A.Total magnetic flux B.Magnetic permeability C.Energy lost as heat per unit volume D.Magnetic susceptibility

Which rule is used to determine the direction of the magnetic field around a straight current-carrying conductor?

A.Fleming's Left Hand Rule B.Right hand thumb rule C.Tangent law D.Newton's Third Law

What is the magnitude of the magnetic field at the centre of a circular coil of radius \(R\) with \(N\) turns carrying a current \(I\)?

A.\(\mu_0 NI / 2R\) B.\(\mu_0 NI / R\) C.\(\mu_0 I / 2\pi R\) D.\(2\pi \mu_0 NI / R\)

Q10

Under which condition will the magnetic needle of a tangent galvanometer show maximum sensitivity?

A.When deflection is 0 degrees B.When deflection is 90 degrees C.When deflection is 45 degrees D.When current is zero

Q11

What is the magnetic dipole moment of an electron revolving in the first orbit of an atom called?

A.Lorentz unit B.Bohr magneton C.Curie constant D.Permeability constant

Q12

A long solenoid has \(n\) turns per unit length and carries a current \(I\). What is the magnetic field deep inside it?

A.\(\mu_0 nI / 2\) B.\(\mu_0 nI\) C.zero D.\(\mu_0 I / 2\pi n\)

Q13

What is the force experienced by a charge \(q\) moving with velocity \(v\) parallel to a magnetic field \(B\)?

A.\(qvB\) B.\(qvB/2\) C.zero D.\(q/vB\)

Q14

What happens when two long, straight parallel conductors carry steady currents in the same direction?

A.They repel each other B.They rotate clockwise C.They attract each other D.No force acts between them

Q15

How can the voltage sensitivity of a moving coil galvanometer be increased without changing its current sensitivity?

A.By increasing the number of turns B.By increasing the magnetic field C.By decreasing the resistance of the coil D.By increasing the area of the coil

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About this Magnetism and magnetic effects of electric current test

This free online practice test covers Magnetism and magnetic effects of electric current from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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