Whet I Suppose the magnetic field has an initial value of a.10Tat time t=0 and increases at a constant rate of o.s00 T. The har starts at an initial position 0.t00 m te the right of the resistor at t0, and again moves constant speed of 15 ms. Derive time varying exprenions for the fullowing quante (e) the current through the 8.00 D resistor (Use the foowing as necessary: t Assume ) in A and tis ins De not include unite in your anowe) R0) - (0.116 + 0.72)- required te keep the bar moving at a constant speed (Use the following as necesary: t. Assume (inNand tis ins De not indude () the magnitude of the applied force F units in your answer)

For a solenoid in vacuum of length / 10 cm with 10* turns per meter calculate the value of the current if the solenoid is placed in an external uniform magnetic field Bext = 35 µT with field lines exactly opposite to the field produced by the solenoid. Take vacuum permeability µo 4r × 10-' H/m. Provide your answer in Sl units.

DLA bullet train iw traveling at 1d traveling at 320.0Km/hr a location Earth's magnetic Pield where the vertical compon ent 4.75 A10 -3丁 of the wheels Is the the aole los0 m aparti what a'cross the axle? induced potential di pperence in

For a square loop which has 50 turns that are 17 cm on a side, placed in a uniform magnetic field of 0.6 T, find the current needed to create a maximum torque of 12 N.m. Hint Current of A is needed.

A lightning bolt may Cairy a current of O 1.00 x 10²4 A for a short period of time. what is the resulting magnetic field 123m from the bolt? Assume that the bult extends far above and below the point of Observation. (Answer in MT)