1
AIPMT 2006
+4
-1
When a charged particle moving with velocity $$\overrightarrow v$$ is subjected to a magnetic field of induction $$\overrightarrow B$$, the force on it is non-zero. This implies that
A
angle between is either zero or 180o
B
angle between is necessarily 90o
C
angle between can have any value other than 90o
D
angle between can have any value other than zero and 180o.
2
AIPMT 2006
+4
-1
Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of potential difference in volts should be applied across them so that the magnetic field at their centres is the same?
A
2
B
3
C
4
D
6
3
AIPMT 2005
+4
-1
An electron moves in a circular orbit with a uniform speed v. It producess a magnetic field B at the centre of the circle. The radius of the circle is proportional to
A
$$\sqrt {B/v}$$
B
$$B/v$$
C
$$\sqrt {v/B}$$
D
$$v/B$$
4
AIPMT 2005
+4
-1
A very long straight wire carries a current $$I$$. At the instant when a charge +Q at point P has velocity $$\overrightarrow v$$, as shown, the force on the charge is

A
along Oy
B
opposite to Oy
C
along Ox
D
opposite to Ox
EXAM MAP
Medical
NEET