The circuit shown in Fig. E25.33
contains two batteries, each with an emf and an internal resistance, and two resistors. Find (a) the current in the circuit (magnitude and direction)

As a proton passes the origin, its velocity is $3.0\times {10}^5\mathrm{m}/\mathrm{s}$ in the positive x direction. What is the direction of the magnetic field at the point ($12.0\mathrm{cm}$, $5.0\mathrm{cm}$, $0.0\mathrm{cm}$)?

A charged particle moving in a magnetic field has a force to the top of the page when it is moving toward the right and the field is into the page. Is this particle positive, negative or neutral?

What is the force on an electron with velocity $\stackrel{\rightharpoonup }{v}=(3.0\times {10}^5\frac{\mathit{m}}{\mathit{s}})\widehat{i}+(4.0\times {10}^5\frac{\mathit{m}}{\mathit{s}})\widehat{k}$ in a region of space with magnetic field $\stackrel{\rightharpoonup }{B}=(2.4\times {10}^{-4}\mathit{T})\widehat{i}$?

The circuit shown in Fig. E25.33

contains two batteries, each with an emf and an internal resistance, and two resistors. Find (b) the terminal voltage Vab of the 16.0-V battery

The current in a wire varies with time according to the relationship I = 55 A - (0.65 A/s^2)t^2. (b) What constant current would transport the same charge in the same time interval?

The current in a wire varies with time according to the relationship I = 55 A - (0.65 A/s^2)t^2 . (a) How many coulombs of charge pass a cross section of the wire in the time interval between t = 0 and t = 8.0 s? (b) What constant current would transport the same charge in the same time interval?

An idealized ammeter is connected to a battery as shown in Fig. E25.28

. Find (c) the terminal voltage of the battery.

An idealized ammeter is connected to a battery as shown in Fig. E25.28

. Find (b) the current through the 4.00-Ω resistor.