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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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?
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?
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?
Which of the following devices works on the principle of the magnetic effect of electric current?
(1) Electric bell
(2) Electric heater
(3) Electric fan
(4) Electric bulb
Which of the following increases the strength of the magnetic field produced by a current-carrying solenoid?
(1) Increasing the number of turns
(2) Increasing the current
(3) Inserting a soft iron core
(4) All of the above
Which of the following is NOT a property of magnetic field lines?
(1) They form closed loops
(2) They start from the north pole and end at the south pole outside the magnet
(3) They intersect each other
(4) Their density indicates the strength of the magnetic field
Which of the following rules is used to determine the direction of force on a current-carrying conductor in a magnetic field?
(1) Fleming's left-hand rule
(2) Fleming's right-hand rule
(3) Ampere's rule
(4) Lenz's law
The direction of induced current in a coil due to change in magnetic flux is given by _______ law.
The direction of the magnetic field at the center of a circular loop carrying current is given by _______ rule.
The magnetic field at a distance r from a long straight conductor carrying current I is given by the formula _______.
The SI unit of magnetic field strength is _______.
State whether the following statement is true or false: A current-carrying conductor produces a magnetic field around it.
State whether the following statement is true or false: The force on a current-carrying conductor is maximum when it is parallel to the magnetic field.
True or False: The magnetic field inside a long straight solenoid is uniform.
True or False: The magnetic field outside a solenoid is similar to that of a bar magnet.
