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3 years ago

At which angle must a charged particle be moving to experience the greatest magnetic force?

Physics

2 answers:

Anastasy [175]3 years ago

7 0

B) 90° Hope this helps

Natali5045456 [20]3 years ago

6 0

Answer: The correct answer is "90 to the magnetic field".

Explanation:

The expression for Lorentz force is as follows;

$F=qE+qvBsin\theta$

Here, q is the charge, E is the electric field, B is the magnetic field, v is the velocity, B is the magnetic field and $\theta$ is the angle between the speed of the particle and the magnetic field.

If the speed of the charged particle is perpendicular to the magnetic field, in this case, there is maximum magnetic force.

Put $\theta= 90$ in the above expression.

$F=qE+qvBsin90$

$F=qE+qvB$

Therefore, at 90 to the magnetic field, a charged particle must be moving to experience the greatest magnetic force. The correct option is (B).

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Explain two scenarios where a large truck can have the same momentum as a small car.

KengaRu [80]

The momentum, p, of any object having mass m and the velocity v is

$p=mv\cdots(i)$

Let $M_L$ and $M_S$ be the masses of the large truck and the car respectively, and $V_L$ and V_S be the velocities of the large truck and the car respectively.

So, by using equation (i),

the momentum of the large truck $= M_LV_L$

and the momentum of the small car $= M_SV_S$ .

If the large truck has the same momentum as a small car, then the condition is

$M_LV_L=M_SV_S\cdots(ii)$

The equation (ii) can be rearranged as

$\frac {M_L}{M_S}=\frac {V_S}{V_L} \; or \; \frac{M_L}{V_S}=\frac{M_S}{V_L}$

So, the first scenario:

$\frac {M_L}{M_S}=\frac {V_S}{V_L}$

$\Rhghtarrow M_L:M_S=V_S:V_L$

So, to have the same momentum, the ratio of mass of truck to the mass of the car must be equal to the ratio of velocity of the car to the velocity of the truck.

The other scenario:

$\frac{M_L}{V_S}=\frac{M_S}{V_L}$

$\Rhghtarrow M_L:V_S= M_S:V_L$

So, to have the same momentum, the ratio of mass of truck to the velocity of the car must be equal to the ratio of mass of the car to the velocity of the truck.

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3 years ago

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which v

Rudiy27

It's -30N is the correct answer

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