Magnetic Effects of Electric Current
Physics ⇒ Electricity and Magnetism
Magnetic Effects of Electric Current starts at 9 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Magnetic Effects of Electric Current.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 11
A current of 10 A flows through a circular coil of radius 0.1 m with 50 turns. Calculate the magnetic field at the center of the coil. (μ0 = 4π × 10-7 T·m/A)
A proton moves perpendicular to a uniform magnetic field of 0.1 T with a speed of 2 × 106 m/s. What is the magnitude of the force acting on it? (Charge of proton = 1.6 × 10-19 C)
A rectangular coil of 20 turns, area 0.01 m2, carries a current of 2 A and is placed in a uniform magnetic field of 0.2 T. Calculate the maximum torque acting on the coil.
A straight conductor carries a current of 5 A. What is the direction of the magnetic field at a point above the wire if the current flows from south to north?
A wire of length 0.5 m is placed perpendicular to a magnetic field of 0.2 T. If the current in the wire is 4 A, what is the magnitude of the force on the wire?
Calculate the force on a 2 m long wire carrying a current of 3 A placed perpendicular to a uniform magnetic field of 0.5 T.
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?
Name the rule used to determine the direction of induced current in a straight conductor moving in a magnetic field.
State the principle of an electric motor.
State the right-hand thumb rule for finding the direction of the magnetic field around a current-carrying conductor.
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?
What is the shape of the magnetic field lines around a straight current-carrying conductor?
Who discovered the magnetic effect of electric current?
A beam of electrons enters a region with a uniform magnetic field directed into the page. Describe and explain the path followed by the electrons.
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?
