Magnetic Effects of Electric Current
Physics ⇒ Electricity and Magnetism
Magnetic Effects of Electric Current starts at 9 and continues till grade 12.
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See sample questions for grade 11
Explain why a soft iron core is used inside a solenoid to make an electromagnet.
If the current in a solenoid is reversed, what happens to the polarity of its ends?
If the current in a straight conductor is doubled, how does the magnetic field at a fixed distance from the conductor change?
What is the effect on the magnetic field strength inside a solenoid if the number of turns per unit length is doubled, keeping the current constant?
What is the function of a commutator in a DC motor?
Who discovered the magnetic effect of electric current?
A charged particle of charge q and mass m enters a uniform magnetic field B with velocity v perpendicular to the field. Derive the expression for the radius of the circular path followed by the particle.
A long straight wire and a circular loop are placed in the same plane with their centers coinciding. If the current in the straight wire is increased steadily, what will be the direction of the induced current in the loop as seen from above?
A rectangular loop of wire is placed in a uniform magnetic field such that the plane of the loop is parallel to the field. What is the net force and net torque acting on the loop?
If the number of turns in a solenoid is tripled while keeping the current and length constant, by what factor does the magnetic field inside the solenoid change?
State and explain the significance of Lenz's law in the context of electromagnetic induction.
