Examine the scenario.

a stream of positively-charged particles is moving to the left in a magnetic field. the particles experience an upward force.

which choice most accurately describes the effect on the magnetic field on a stream of negatively-charged particles moving to the left?

a magnetic field influences the motion of charged particles. the negatively-charged particles will experience a force upward because positive and negative particles would experience a force in the same direction.

a magnetic field influences the motion of charged particles. the negatively-charged particles will experience a force acting against their motion, so the negatively-charged particles would slow down and stop moving.

a magnetic field does not influence the motion of negatively-charged particles. the particles would continue to move to the left.

a magnetic field influences the motion of charged particles. the negatively-charged particles will experience a force downward because positive and negative particles would experience forces in opposite directions.

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

If the speed of a particle triples ,by what factor does its kinetic energy increase?

For problems 1-3, consider a simple dc brush motor with a permanent magnet stator. with an an consider a simple dc brush motor with a permanent magnet ae supply voltage of 100 v, the no-load speed of the motor is 1000 rpm. this motor can provide a torque of 1.9 n-m at 800 rpm drawing a current of 2 a current are both zero at no load.) 1. with an armature supply voltage of 100 v, the motor is operated at 900 rpm. what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input? what is the energy efficiency of the motor? with an armature supply voltage of 100 v, the motor is operated at 1100 rpm (where it acts as a generator). what torque input is required? what mechanical power is required what current is generated? what is the electrical power generated? what is the energy efficiency of the motor acting as a generator? 2. with an armature supply voltage raised to 120 v, the motor is operated at 1000 rpm. what is the no-load speed? what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input what is the energy efficiency of the motor? 3.