Bihar TET · Mathematics and Science (Paper II)
Current, circuits and magnetic effects.
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Q1 · Electricity and Magnetism · EASY
A student connects a bulb, a cell, and a switch in a circuit. When the switch is open, the bulb does not glow. What is the reason for this?
Q2 · Electricity and Magnetism · MEDIUM
A copper wire carries an electric current from south to north. According to the right-hand thumb rule, if the thumb points in the direction of current, the fingers curl in the direction of the magnetic field. In which direction will the magnetic field lines circle around this wire at a point to the east of the wire?
Q3 · Electricity and Magnetism · MEDIUM
Three resistors of resistances 2 ohm, 3 ohm, and 6 ohm are connected in parallel across a 6 V battery. What is the total current supplied by the battery? (Assume the battery has negligible internal resistance.)
Q4 · Electricity and Magnetism · HARD
A rectangular coil of 50 turns, each of area 0.1 square metre, is suspended in a uniform magnetic field of 0.02 T. The plane of the coil is initially parallel to the magnetic field. The coil is rotated through 90 degrees so that its plane becomes perpendicular to the field. If this rotation takes 0.05 seconds, what is the magnitude of the average induced emf in the coil?
Q5 · Electricity and Magnetism · MEDIUM
In an electric circuit, the device used to measure electric current is called: