Commercial electric motors do not use
An electric bulb rated 220 V is connected to 220 V, 5 Hz AC source. The bulb
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The magnetic field inside a long straight solenoid carrying current
An induced emf is produced when a magnet is plunged into a coil. The magnetic field of induced emf does not depend on
An AC of frequency 50 Hz changes its polarity after every
What material is used to make a fuse wire?
In case of a current-carrying circular coil, the magnetic field is maximum
A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, then the new value of magnetic field is
The magnetic field at a distance of 10 cm from a long wire carrying current is 2 tesla. The magnetic field at a distance of 20 cm is
A straight wire of mass 200 g and length 1.5 m carries a current of 2A. It is suspended in mid air by a uniform horizontal magnetic field whose magnitude in Tesla is
When a charged particle moving with the same velocity is subjected to magnetic field, the force acting on it is non-zero. This implies that
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each
What is the current rating of power switch current in our household circuit?
What is the potential difference of current in Indian household circuit?
Which polarity is developed on the face of the solenoid when a north pole of a magnet is moving towards it?