The potential difference across a resistor increases by a factor of 2. how does the current change? (ohm's law: v = ir) a. it decreases by a factor of 2. b. it increases by a factor of 4. c. it increases by a factor of 2. d. it decreases by a factor of 4.

Acoil formed by wrapping 80 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 28.0° with the direction of the field. when the magnetic field is increased uniformly from 200 µt to 600 µt in 0.400 as, an emf of magnitude 80.0 mv is induced in the coil. what is the total length of the wire?

If element x has 99 protons how many electrons does it have

Asmall grinding wheel has a moment of inertia of 4.0×10−5 kg⋅m2 . what net torque must be applied to the wheel for its angular acceleration to be 150 rad/s2 ?