A Bob of Mass M (M = 0 $\mu$ C) Is Held by a Massless String in a Uniform

Multiple Choice

A bob of mass m (m = 0.500 g) , and charge magnitude Q (Q = 50.0 $\mu$ C) is held by a massless string in a uniform electric field E. If the bob makes an angle of 10.0 degrees with the vertical, then calculate the magnitude of the electric field E and the sign of the bob charge Q.

A) 1.73 *10¹ N/C and Q is positive.
B) 9.81 *10¹ N/C and Q is negative.
C) 9.81 * 10¹ N/C and Q is positive.
D) 1.73 *10¹ N/C and Q is negative.
E) 1.80 *10^-1 N/C and Q is positive.