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In a meter bridge the point D is a neutral point
a) The meter bridge can have no other neutral point for this set of resistances
b) When the jockey contacts a point on meter wire left of D, current flows to B from the wire
c) When the jockey contacts a point on the meter wire to the right of D, current flows from B to the wire through galvanometer
d) When R is increased, the neutral point shifts to left.

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All are true

a, b & c are only true

b & d are only true

a & b are only true

answer is C.

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Detailed Solution

At D, balancing condition is $\frac{l}{100 - l} = \frac{R}{S} \Rightarrow l = \frac{100 R}{R + S}$

Therefore, the meter bridge can have no other neutral point for this set of resistances.

At point D, the bridge is balanced. So if jockey contacts a point on the meter wire to the right of D, the bridge will loose the balance and current flows from B to the wire through galvanometer.

When R is increased, neutral point will shift to right.

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