The equivalent resistance of a 10 Ω resistor and a 30 Ω resistor connected in parallel is

A circular coil with an area of 0.0500 m2 is wrapped with 500 turns of wire and is placed in a uniform magnetic field perpendicular to its plane. If the field changes in value from -0.100 T to +0.150 T in an interval of 0.500 s, what is the magnitude of the average voltage induced in the coil?

According to Lenz’s law the direction of an induced current in a conductor will be that which tends to produce which of the following effects?

Two parallel conductors each of 0.50 m length, separated by 5 x 10-3 m and carrying 3.0 A in opposite directions, will experience what type and magnitude of mutual force? (magnetic permeability in empty space μ0 = 4π x 10-7 T m/A)

The magnetic field inside a 100-turn solenoid .020 m long that carries a 10 A current is

Three resistors, each with resistance R1, are in series in a circuit. They are replaced by one resistor with equivalent resistance R. Comparing this resistor to the first resistor of the previous circuit,

A 12 V potential difference is applied across a series combination of four 6 Ω resistors. The current in each resistor is

The plate area of a parallel-plate capacitor of capacitance C is doubled and the distance between the plates is halved, so that the volume of the dielectric remains the same. The new capacitance of the capacitor is

Ten million electrons are placed on a solid copper sphere. The electrons become

When a 100 W, 240 V light bulb is operated at 200 V, the current that flows in it is